Ok really embarrassed (and not helping my I am an intelligent and non-dizzy blonde case) but how the hell do I open up the top bit to get the old batteries out. Have got as far as opening the metal size bits out and cleaning off the blood from where I have just sliced my thumb open...now im stuck and getting frustrated, want to get new batteries in and then I can get to work on my battery-powered fairy lights round it! :-[