Thanks guys. Tutorial seems like a large word - I am just documenting my mistakes...
Anyway, here is a new stuff-up. I was following Jim Kingshott's procedure for cutting lap dovetails. It looks very simple. He gets beutifully clean sockets. The photos show what I get.
Unfortunately I have no matching timber to make a new front, so SWMBO will have to do with a glued-up front. (Assuming I manage to fix this...)