summary on their website.
It seems to have been producer David Richardson's idea: "These will be adaptations of the Missing Adventures novels that Gareth wrote for these characters...I read The Romance of Crime and The English Way of Death about a year ago, and completely fell in love with them. It had struck me that they would make great audio stories, and so when this team came aboard we approached Gareth for the rights to make them."
“The Romance of Crime is an outer-space story set on a futuristic prison where the executed criminal Xais returns to wreak revenge. The English Way of Death is set in 1930, where an evil creature named Zodaal threatens the future of the world.
“These stories have now been recorded, and they felt very special. John Dorney faithfully adapted them as four-part stories, and the guest casts are wonderful –Terrence Hardiman (Doctor Who: The Beast Below) is phenomenal as the evil Stackhouse, and wait until you hear Michael Troughton as flamboyant artist Stokes…”
"Big Finish also hope at a later date to adapt Gareth’s novel The Well Mannered War, thus completing his trilogy of Fourth Doctor novels."
'nuff said. You can preorder it here.