I did the usual search on Google and one site (I forget which) had a description of every single character in all the books to date. Tom was described as a "wizened toothless walnut." I thought, "That's cool. At least he's not a muggle."
My scenes were with Daniel Radcliffe and Robert Hardy (Cornelius Fudge). I took my son Louis to visit the set and met Alan Rickman (Severus Snape) in the canteen carrying a tray with his lunch. He said hello and signed an autograph for him. Daniel, Rupert and Emma all signed Louis' Harry Potter lunch box he takes to school. I also met Paul Whitehouse (Sir Cadogan) who is a very successful comedian in the UK. I was also briefly in a scene with Julie Walters who seemed very nice.