Brilliant. I've always wanted to give it a go. I'm not great with books, but I'm a quick study if I can get my hands on something and actually, I guess, work through it by doing?

[Harry wonders if it's true that an animagus can only ever learn to shift into the form of their patronus and, if that's so, will he always have the same patronus he did as a child? That might be a touch awkward to explain.]