Richard was in heavy, heavy costume, he could hardly sit, you know, and I turned up and they put me in two layers of silk, so I played him much lighter - you know, floating around in a pair of slippers, a bit of a hippy.
There's no subtext in Harry Potter really; it's all magic, anything can happen. Why do I say this? Because it's a magic spell. It's quite nice in a way. There is a real freedom to it.