Thanks for the information on this thread. I was slightly worried at the start, at the thought of not having a master key. However according to replies on here and the owners manual the Sportcross only had 2 button master keys. The key I currently have locks/unlocks the glove box and the light automatically goes out when I insert into the ignition aswell. On reference to the boot, there is no key lock. Went to my local key cutting place they can duplicate the key for £60 but it's a basic key without any buttons so I think I'm better going to Lexus and paying £200 to get another master key.