The placards read "No Classics? No 50th!!" and "Have a heart - Classic Doctors want a part". Before you think they've both had a sudden rush of blood to the head, if you look closely at the next two photos, you can see camera/microphone on the right. Conor Keegan has also confirmed that there were 2 cameras there - one close and one on the other side of the road...both trying to keep a low profile:
I'm going to put this little bit of strange Monday madness down to a dvd extra...or something to go online nearer the Anniversary. Whatever it is, it's certainly brightened up a dull Monday morning and made me realise that I really do love these guys - the Classic Doctors have an obvious love and affection for the show so I take my hat off to them...no matter what they're up to....
Photos copyright to and published here with the permission of Conor Keegan - thank you very much!
UPDATE: it appears Peter Davison is filming a short tongue-in-cheek film for the 50th - so it could well be to do with that.