Harry, William and Kate paid a visit to Warner Bros. Studios in Hertfordshire, the only UK film studio operated by a Hollywood company, ahead of its inauguration. Naturally, that means Harry Potter related hijinks ensued!

Husband and Wife did battle in Gryffindor's common room:

And then the Flight Lieutenant swapped his RAF Sea King for... well, the Batpod:

I do love a bit of Royal Family goofiness. There's a few more pictures at the BBC.