What has happened to the tips of my Tomato plant?

Hiya , wish I could help you but im just learning ...but ..I think I know a man who can , get in touch with Nick he has been a great help to me and will send you monthly updates free of charge http://www.tomatogrowing.co.uk/

If it is outside it could be frost damage. Mine were badly hit and I thought it was curtains for them but the side shoots have now grown up and I have cut off the dead leaves and it seems ok, just a bit of a funny shape.