When Reeltime expanded into producing original dramas, Briggs wrote some stories and acted in others, beginning with Wartime, the first unofficial Doctor Who spin-off, and Myth Runner, a parody of Blade Runner showcasing bloopers from the Myth Makers series built around a loose storyline featuring Briggs as a down on his luck private detective in the near future.

Briggs wrote and appeared in several made-for-video dramas by BBV, including the third of the Stranger stories, In Memory Alone opposite former Doctor Who stars Colin Baker and Nicola Bryant.

He also wrote and appeared in a non-Stranger BBV production called The Airzone Solution (1993)[5] and directed a documentary film, Stranger than Fiction (1994).

On 9 July 2009, Briggs made his first appearance in the Doctor Who spin-off Torchwood in the serial Children of Earth, playing Special Government Advisor Rick Yates.

[13] He appeared in this alongside a mix of modern and classic Doctor Who actors including; Peter Davison, Richard Franklin, Simon Fisher Becker and Terry Molloy.

In 2013, Briggs portrayed the Dalek voice actor Peter Hawkins in the BBC docudrama An Adventure in Space and Time, which depicted the inception of Doctor Who.

[15] Briggs also directed, created the sound design and composed the incidental music for all three series of the BBC Radio 4 science fiction comedy Nebulous, written by Graham Duff and starring Mark Gatiss.