Rouge, what a great idea. Never thought of protecting it with something on top.

I had it on 150, DH did ask if that was right and I said I was sure it was, glad I got one thing right

DH got a bit excited that we could smash it up and eat it - make another in the morning - but then he went and looked at it and said it might be ok.

The square had just under an hour and looks fine - just a few cracks in the top but really topical, don't seem to be structural

Pac - that's a good idea - I do have a 3kg tub of buttercream icing

I've also just remembered that I'm cutting it up into shapes. Wonder if I could position the stencils around the cracks? That might work.......