We’ve already seen various episodes with the Doctor in Victorian London, often at Christmas and usually with snow. There has been “ghosts”, werewolves, Cybermen. There was of course the quasi-Victorian planet with flying fish and sharks too. This year we saw snowmen, a Silurian, Madam Vastra and a Sontaran. There is some talk of a spin off involving Madam Vastra and I hope there is, because I think it would work well, and there are quite a few connections to existing stories and canon. For example, there may well be steampunk influences with a Victorian Torchwood using alien influenced tech to find and defeat alien threats to the British Empire. if you watch Tooth and Claw you will hear the doctor talking about steam powered starships of the British Empire if the wolf gets its way. Tooth and Claw in itself would make a good scenario, Victorian British Infantry versus monks and a werewolf.
The real way to play games in the Doctor Who universe is to avoid using the Doctor and focus on the other characters in the story, use UNIT for example, or play out the scenarios prior to the involvement of the Time Lord.