It is quickly becoming a joy to see Harry Melling on stage. Aside from Daniel Radcliffe he's probably made the most successful transition from a 'Harry Potter actor' to an accomplished actor in his own right.

I first saw him at the National Theatre in Mother Courage and All Her Children, ironically playing son to his Harry Potter screen mother Fiona Shaw and then he stole his scenes in Women Beware Women, also at the National.

Last year he got his first lead in the wonderful When Did You Last See My Mother at the Trafalgar Studios and I was hooked. So much so that I couldn't miss seeing him play Christopher Isherwood in I Am A Camera at the Southwark Playhouse.

And he didn't let me down. Once again he carries off a role with such confidence and skill it is easy to forget that he is only 23 - there must have been something in the water in the Dursley house.

Set against the back drop of the rise of the Nazi's in 1932, a young Isherwood is living in Berlin, barely earning his keep tutoring the daughter of a rich Jewish family. Forced to take a smaller room at his lodgings by his financial situation he quickly becomes friends with rebellious posh girl Sally Bowles (Rebecca Humphreys) who takes his old room and who survives earning money singing in clubs and eating out on rich men.