Starring Matt Smith as novelist Christopher Isherwood, Christopher And His Kind explores Isherwood’s formative years in 1930s Berlin in the run-up to the Second World War and aired at the weekend on BBC Two.

Sax also directed the Doctor Who TV Movie in 1996, introducing Paul McGann as the Eighth Doctor.

Discussing the show’s post-2005 era, Sax told CultBox: “Yeah, I really like it. Julie Gardner asked me to direct one of the very early episodes, but I couldn’t do it as I was tied up with another job. But they’ve all done an amazing job with it. Russell T Davies’ scripts are always of an extraordinary high quality. All the actors have been great too: Christopher Eccleston, David Tennant and now Matt. Matt’s just incredibly watchable.”

Speaking to promote Christopher And His Kind, he commented: “Funnily enough, they approached me recently about [directing] a Christmas [Doctor Who episode] and again I was tied up so couldn’t do it. But I’d love to work with Matt again.”

He continued: “I always enjoy working with actors who take the job seriously and are prepared, so I’d very much welcome the chance to work on the show.”