If you’re a villain, looking for your next secret base with full luxury trimmings, look no further than this reconstructed 19th century Palmeston fort in the Solent just off the Isle of Wight.
The Sea Devils!
Why, you might ask? Why here? Well, back in the day when the Master was in a UNIT holding facility in nearby Portsmouth watching The Clangers, this is the location from where the Sea Devils appeared to threaten the Third Doctor and Jo Grant. If you click the link, there are lots of clips from the story and many more pictures.
Who knows, could it be the venue for an exclusive Doctor Who convention? Maybe Missy could take it over as her new pad?