Roof of the World
In 2004, Big Finish Productions produced the Rigelsford-written "The Roof of the World" as part of their main range "Doctor Who" audio plays. It starred Peter Davison as the Fifth Doctor. He was attached to write for the "Lethbridge Stewart" spin-off books, before being quietly dropped. He did contribute to the screenplay for the 2012 horror film "The Seasoning House".