In later service, Colgan was a member of the award-winning Met Police Problem Solving Unit that used behavioural economics and creative thinking to tackle issues that did not respond to traditional policing/enforcement methods.

He worked closely with the UK Home Office and the UCL Jill Dando Institute of Crime Science.

Colgan's first published illustration work was for the book I Remember: Reflections on Fishing and Childhood (Summersdale 1995) by Joe Cowley, Frederick Forsyth, Roger Daltrey, Bernard Cribbins, George Melly and others.

The QI 'H' Annual 2011 features a two-page spread co-written by himself, Justin Pollard and John Lloyd, called HENJ in which IKEA-style instructions for building Stonehenge are seen.

In 2011, Colgan was invited to participate in the annual Royal College of Art Secret Auction alongside such notables as Yoko Ono, Tracey Emin, Nick Park and Grayson Perry.

Some of the monsters then featured in an exhibition hosted by Grayson Perry at Bristol Museum & Art Gallery and in the book of the series.

It tells the story of his tenure with the Problem Solving Unit and carries cover quotes from Stephen J Dubner and Rory Sutherland.

In 2012 he co-wrote the pilot for a radio series called 101 People to Meet Before You (Or They) Die with Dan Schreiber.

After broadcast, a live show followed featuring on-stage interviews with Marc Abrahams and Dr Jan Bondeson.

He has appeared on many podcasts including Freakonomics, Level Up Human, Little Atoms and the online live panel show Ex Libris.

He has performed at venues and events such as TEDx, Glasgow Science Festival, Agile Cymru, Google Huddle, Hybrid Conf Berlin, the Ig Nobel Prizes, QEDCon, Aegis Kuala Lumpur and has performed many Skeptics in the Pub and Science Showoff shows.