BondPotterWho
Quite a long time ago, I noticed that quite a lot of actors in the Harry Potter movies have also been in Doctor Who, and there are also several actors in Harry Potter that have also been in one of the more recent Bond movies. This led to a conversation with some like-minded friends, during which we decided that, like a Bacon number, british actors should have a ranking system based on how many of the UK's national institutions in which they have appeared, and that we should use Harry Potter, James Bond and Doctor Who as our three. We also decided that John Cleese is the only one we could think of who's been in all three.
In fact, there are four. The obvious one, John Cleese, had a cameo role as an art critic in the Doctor Who episode "City of Death", a slightly larger role as Nearly Headless Nick in Harry Potter, and a role as Q's replacement in two Bond movies.
Julian Glover has also been in all three. He's one of those actors who has been in practically everything but nobody really notices him. He's been in Star Wars and Indiana Jones, and two roles in Doctor Who, most memorably Scaroth in "City of Death". He played the villan Kristatos in For Your Eyes Only, and voiced Aragog the spider in Harry Potter and the Chamber of Secrets. Yes, we are counting voice roles.
Helen McCrory is best known as Narcissa Malfoy in the Harry Potter movies, but has appeared in Doctor Who as head vampire Rosanna in "Vampires of Venice", and as the MP Clair Dowar in Skyfall.
Last, but by no means least, we have Greg Bennett. Judging from his IMDB profile he's a background actor for hire, he's been in pretty much everything. He's had multiple roles in Doctor Who, and has also appeared in the other two, albeit in uncredited minor roles.
Interestingly, only three lead actors have "crossed over" as it were. Two Doctors have appeared in Harry Potter; David Tennant and John Hurt (because he counts as a Doctor in my book.) and only one Bond, Timothy Dalton, has appeared in Doctor Who, as the corrupt Time Lord leader, Rassilon.
A few other honourable mentions before the complete list. BBC News presenter Huw Edwards has managed to play himself in both Doctor Who and James Bond. He appears on the television in the Doctor Who episode "Fear Her", and also in Skyfall. BAFTA and Golden Globe winner Bill Nighy has had walk-on roles in both the Doctor Who episode "Vincent and the Doctor", and in the first part of Harry Potter and the Deathly Hallows, and was rumoured to be in the running to play the ninth Doctor back in 2005. Finally, veteran actor Warwick Davis has yet to appear in a Bond movie, but that's not to say he won't one day, seeing as he's been in pretty much everything else!
On the subject of people who have been in virtually everything, Martin Freeman doesn't appear to have been in Doctor Who, James Bond or Harry Potter. I'm sure this will be rectified soon, especially as he clearly knows Steven Moffat.
I'm sure this list will be revised in the future, especially as Downton Abbey and Coronation Street both seem to be melting pots of well-known actors these days. In the meantime, here's a complete list of everyone who's been in more than one of Doctor Who, James Bond and Harry Potter, plus links to IMDB so you can see who they played. Enjoy, stats fans.

Seems like my blog's becoming more and more like the telly these days - full of repeats. I will remind you of