[1] Gwynn began his career in 2007 writing for BBC Radio 4 on Listen Against and continued to do so until 2011.
[1] Since 2010, Gwynn has continued to write for radio but expanded into television too including The Armstrong & Miller Show, Have I Got News For You,[3] O'r Diwedd and Top Gear.
Together with Sian Harries and Tudur Owen, he is part of the writing team for the semi-improvised show Tourist Trap for BBC One Wales.
[1] He has also contributed to Trying on Apple TV[3] and co-wrote the 2019 audio special The Goodies: The Big Ben Theory for Audible.
[6] He has appeared as a guest on The Now Show several times[1] and has also presented documentaries for BBC Radio 4 including Gareth Gwynn's Little Book Of Welsh Rock,[7] The Greatest Ever Faker[8] and two editions of Archive on 4, Gareth Gwynn's Alternative Archive[9] and Gareth Gwynn Hasn't Fin-[10] as well as producing Just A Minute: 50 Years In 28 Minutes and Rik Mayall, Panglobal Phenomenon.