Thanks for the replies really useful - looks like I have over cut it

Took a few photos last night not sure how much help they are . BTW the orange thing is a silicone baking tray I got from a pound shop !

http://i1267.photobucket.com/albums/jj5 ... 235514.jpg
http://i1267.photobucket.com/albums/jj5 ... 235458.jpg
http://i1267.photobucket.com/albums/jj5 ... 235613.jpg
I' should get some measurements tonight