Innovation Training London: The MARVELous Ideas Sprint

What Innovation Training Looks Like at Sidestream

Some teams cannot be lectured into having better ideas, they have to be put in a room where a bold idea is the only way out. That is the whole design of Sidestream's innovation training in London. Instead of a creativity toolkit and a flipchart, the cohort gets a brief it did not expect, a deadline, and a panel that does not want to be impressed.

The brief is the MARVELous Ideas challenge, the same format Sidestream describes on its training and workshops page. Teams design and pitch a pilot episode for a new Marvel series using unused characters. Each pilot needs a unique hero, an antagonist, a twist and a memorable ending, and the pitches are judged on creativity, appeal and practicality. Nobody in the room is a screenwriter, which is the point. The brief takes the team out of its own product, its own budget line and its own politics, so the only thing left to work with is the behaviour: proposing something before it is polished, building on a colleague's half-idea instead of correcting it, and defending a concept under pressure without retreating to the safe version.

Then comes the part a brainstorm never includes: the tear-down. Professional actors play a sceptical panel, studio executives, investors, a board, whatever the diagnostic says the team actually faces. They interrupt, they ask the question the team hoped to avoid, they go quiet at the wrong moment. The team hears the objection, rebuilds the pitch and comes back to the same panel. The actors are briefed on the specific habits the cohort needs to break, so the second and third rounds press exactly where the first one gave way.

Because the framing is unexpected, the usual escape routes are closed. Nobody can say the idea would never get budget, because there is no budget. Nobody can defer to the person who owns the product, because nobody owns a superhero. What remains is a team practising, in public and in front of a panel, the behaviour it needs back at work: generate, pitch, take the hit, rebuild, pitch again.

Why a Pitch Challenge Instead of a Brainstorm

A brainstorm rewards whoever speaks first and loudest, treats quantity as the goal, and ends when the sticky notes run out. The ideas are rarely pitched to anyone, rarely challenged by anyone, and rarely rebuilt. The team leaves with a photograph of a wall, and the sigh when somebody next says "let's brainstorm" is the honest review.

A pitch challenge changes three things. The idea has to survive contact with a listener, so it has to be built to a standard, not just listed. The challenge comes from actors who are paid to be difficult and briefed to be specific, so the objections are the real ones, not the polite ones colleagues offer each other. And the rebuild is part of the design, not an afterthought: the round is only over when the panel has heard the second version.

This is the same reason Sidestream uses rehearsal with professional actors across its behaviour change workshops: knowing a method for idea generation and using it in front of someone who is not convinced are two different skills, and only the second one changes what happens in the next product meeting.

Who Innovation Training in London Is For

The sprint is built for one organisation at a time, so the brief, the panel and the objections are calibrated to the people in the room. Three groups typically commission it.

• Founders and scale-up teams whose pitches are polite in the room and dead by the next morning, and who need a way to hear what investors, studios or partners are not saying. The documented MARVELous Ideas case below is this group.
• Product, marketing and strategy teams whose pipeline has narrowed to safe variants of last year's idea, and whose planning rounds have become a place where bold concepts are quietly filtered out before anyone pitches them.
• Leadership teams that have asked for more innovation and are getting more risk aversion instead, and who want experimentation, fast prototyping and constructive challenge to become normal behaviour rather than a value on a slide. The programme block on our page for companies lists this as the Innovation Mindset Sprint.
• Not the right fit: a team that wants a lecture on ideation frameworks, a certificate, or an open course with strangers. Sidestream runs no open courses and issues no certificates; every cohort comes from one organisation.

How the Innovation Mindset Sprint Runs: Six Steps

Every Sidestream programme follows the same six-step method, the one described in full on our corporate training London page. Applied to innovation training, the steps look like this.

Step 1: Diagnose the Specific Behaviour

Interviews with the sponsor and a sample of the team, a look at how ideas currently get proposed, tested and killed, and a short list of the behaviours the sprint will target: proposing an idea before it is finished, building on someone else's suggestion, defending a concept under challenge, treating a rejection as information. Weeks 1 to 3 for most engagements.

Step 2: Design the Scripted Scenario

The MARVELous Ideas brief is fixed; what gets written is everything around it. The pitch criteria, the timing of each round, and above all the panel's objections, which are drawn from the diagnostic so that the actors raise the questions this team actually hears, not generic ones.

Step 3: Cast the Professional Actor Ensemble

Actors are cast and briefed to play the panel the team needs to face, sceptical studio executives for a scale-up, an investment committee for a founder team, a board for a leadership cohort. Casting runs parallel to design.

Step 4: Deliver the Immersive Rehearsal

Two days in person. Day one builds the concepts and runs the first pitches and the first tear-down. Day two is rebuild, second round, rebuild, third round, against the same panel, with a debrief after each round that names the behaviour rather than the idea. The half-day Pitch Challenge compresses this to a single build-pitch-rebuild cycle.

Step 5: Embed Through Structured Follow-Through

Six to eight weeks of follow-through, in which a typical design would hand the team its own pitch-rehearsal ritual: a fixed slot where new ideas are pitched to colleagues playing the panel, with the same criteria and the same rule that the round ends after the rebuild.

Step 6: Measure at Kirkpatrick Level 3 or 4

Observed behaviour in real work is the minimum standard: ideas proposed, pitched and tested in actual meetings, as seen by the sponsor and by the team itself, measured against the baseline three to six weeks after delivery and again at around 90 days. Where the brief allows, downstream measures such as concepts taken to prototype are added.

A Documented Case: MARVELous Ideas

A scale-up team had to pitch a Marvel-series concept to a major studio, but their pitches kept dying in the room. Investor feedback was polite. Their founders couldn't see why.

Sidestream ran a "pitch and tear-down" workshop with professional actors playing sceptical studio executives, with real-time behavioural feedback on body language, framing and persuasion patterns, and iterative rounds in which each pitch was rebuilt and re-tested against the same actor panel. It took three rounds to a confident, investor-ready pitch, and a repeatable framework for every future fundraise. The team now run their own pitch-rehearsal ritual internally.

A co-founder of the London scale-up put it this way: "We finally heard what investors weren't telling us. The actors were brutal, and that's exactly what we needed." A programme participant described the sprint itself: "Two days, more usable ideas than the previous quarter. The unexpected framing did the work, and our team has stopped saying 'let's brainstorm' with that sigh." The full case is on our case studies page as MARVELous Ideas.

Innovation, Problem Solving or Behavioural Design: Which Workshop?

Three Sidestream workshops sit close to each other and are often asked for interchangeably. They rehearse different behaviours.

Innovation training, this page, rehearses generating an ambitious idea, pitching it and rebuilding it under challenge. Our problem solving workshop in London rehearses the decision meeting itself: how a problem is defined, which biases shape the deliberation and whether dissent is surfaced, with actors playing the stakeholders rather than a pitch panel. Our behavioural design workshop in London sits one level up and uses the COM-B framework to design the conditions under which a target behaviour, including experimentation, becomes likely across an organisation.

A team whose ideas are good but die in front of decision-makers belongs here. A team that generates plenty of ideas and then decides badly belongs in the problem-solving room. A leadership team that wants to change the conditions for innovation across several hundred people starts with behavioural design and may add the sprint for the teams that will carry it.

Formats, Group Sizes and Where It Runs

The Innovation Mindset Sprint runs over two days in person; the Pitch Challenge is the half-day version, usually as the working part of an away day or a planning offsite. Cohorts are 12 to 25 participants, always from one organisation, so that the panel's objections and the follow-through belong to that team. Larger groups are split into parallel cohorts with the same panel.

From the first call to the follow-up measurement the engagement takes 12 to 16 weeks, depending on format: diagnostic in weeks 1 to 3, design and casting, the two days themselves, six to eight weeks of embedding, then the measurement points. Sidestream is based at 58 Malden Road, London NW5, and works from London, Milan and Berlin; the sprint runs at your office or at a venue Sidestream recommends. Every programme is priced per engagement after a free consultation, and the client journey page walks through the stages in detail.

Frequently Asked Questions

What is innovation training?

At Sidestream, innovation training is a two-day sprint in which a team builds an ambitious idea under an unexpected brief, pitches it to professional actors playing a sceptical panel, and rebuilds it after each round. The aim is a change in observable behaviour, proposing, pitching and defending ideas at work, rather than familiarity with an ideation framework.

How is a pitch challenge different from a brainstorm?

A brainstorm collects ideas; a pitch challenge tests them. In the MARVELous Ideas format each team has to build a concept to a standard, pitch it to actors briefed to raise the objections this team actually hears, and come back with a rebuilt version. The round only ends after the rebuild, so the behaviour that gets practised is the one a product meeting needs.

How long does the Innovation Mindset Sprint take?

The sprint itself is two days in person; the Pitch Challenge is a half-day version. The whole engagement, from the first call through diagnostic, design, delivery, six to eight weeks of embedding and the follow-up measurement, takes 12 to 16 weeks depending on format.

Who should attend, and how many people?

Cohorts of 12 to 25 from one organisation: founders and the people who pitch with them, product, marketing and strategy teams, or a leadership team that wants experimentation to become normal behaviour. Sidestream does not mix organisations in a cohort, because the panel's objections and the follow-through are written for one team.

How is innovation training measured?

Observed behaviour in real work, Kirkpatrick Level 3: ideas proposed, pitched and tested in actual meetings, as seen by the sponsor and the team, measured against a baseline three to six weeks after delivery and again at around 90 days. Where the brief allows, downstream measures such as concepts taken to prototype are added.

Does Sidestream run open innovation courses or issue certificates?

No. There are no open courses with mixed attendance and no certificates. Every programme is designed for one organisation, priced per engagement, and judged on whether the behaviour changed, not on attendance.

Where does the innovation training run?

At your London office or at a venue Sidestream recommends. Sidestream is based at 58 Malden Road, London NW5, and works from London, Milan and Berlin, so the sprint can also run for teams outside the UK.