I think I will take it all back to Tesco first and see what they can do, you never know I might just get someone in a good mood!!
Large Supermarkets are usually pretty good at taking in damaged goods. It is surely still under guarantee & it's just not worth the bother for them to prove that you broke the screen & it didn't happen 'spontaniously'..............they send them off to be repaired so may take some time.