Prisoner of Azkaban DVD launch

1 of 16 What's this coming out of the smoke in a mysterious location in London?

2 of 16 It's the Knight Bus - it can only be the launch party of the Harry Potter and the Prisoner of Azkaban DVD

3 of 16 And sure enough - Dan, Rupert and Emma emerge from the vehicle...

4 of 16 They're quickly joined by Stan Shunpike, the hapless driver of the wizard bus

5 of 16 A group shot of the Azkaban cast

6 of 16 Emma Watson (Hermione) chats happily to the world's media

7 of 16 Rupert looks thoughtful when he's being interviewed - tricky question hey?

8 of 16 James and Oliver Phelps (the Weasley twins) were there too

9 of 16 Chris Rankin, who plays Percy, joined his fictional brothers at the bash

10 of 16 Matt Lewis (Neville Longbottom) did his interviews with Filch actor David Bradley

11 of 16 And Devon Murray (Seamus Finnegan) chatted away as usual

12 of 16 Brothers on-screen and mates off - Oliver Phelps and Rupert Grint have a laugh together

13 of 16 Azkaban director Alfonso Cuaron said making the Potter film was one of the great experiences of his life

14 of 16 Haughty Hedwig got in on the act too!

15 of 16 Thomas Sangster - star of Love Actually and Featherboy! turned up for the party

16 of 16 Lizo bumped into classical musician Myleene Klass, formerly of Hear'Say