This week marks two decades since the first time I got to write for that most quintessential of British science fiction heroes – the Doctor!

In 2005, Big Finish Productions released Singularity, an audio drama featuring the 5th incarnation of the Timelord and his travelling companion Turlough – in the story, they arrive in a wintry near-future Moscow and encounter an insidious, secret invasion by beings from the very end of time that may change the course of human existence…

Russia, the ne...