Doctor Who writer Mark Gatiss has revealed the Peter Capaldi’s Doctor will have “a whole new set of rules” in the new series.

Speaking to Digital Spy at last night’s London Lesbian & Gay Switchboard 40th Anniversary Gala, Gatiss revealed: “Peter has a very different energy to Matt Smith and to David Tennant. He’s older which changes everything – it’s amazing what a change does!”

He added: “Matt was sublime and I was very sorry to see him go, but it’s also great to have a change – as it has always been with the Doctor.”

The Sherlock co-creator explained: “The Doctor’s always the Doctor – but you can have a lot of fun playing with people’s expectations,” he continued. “Everyone knows how the previous Doctor would react in any given situation – and now you just don’t know!”

Written by showrunner Steven Moffat, Capaldi’s debut episode was also described by Gatiss as “exciting”, “disturbing” and “thrilling”.

Series 8 is currently filming in Cardiff and is expected to begin airing on BBC One in August.

> Here’s everything we know about Series 8 so far.

What do you want to see in Peter Capaldi’s first episode? Let us know below…