My first London MUST SEE is an exciting exhibition that is currently on at the Barbican Centre. Called ‘The Rain Room’ it offers you the once in a lifetime opportunity to feel that little bit superhuman. If you’ve ever watched Bruce Almighty and felt jealous of Jim Carrey’s superpowers, this is for you. After years of having played slave to the reliably rubbish London weather, The Rain Room gives you the chance to get your own back(ish)…