Dame Maggie Smith may have come to the Harry Potter films with two Oscars (for The Prime of Miss Jean Brodie and California Suite) in hand and fistfuls of other awards and plaudits, but to millions of children around the world, she will forever be Professor Minerva McGonagall. Here she is looking suitably timeless in 2000 (left) and 2009 (right), though someone has tidied up her hat

Photograph: PR