Lesson 1: Never give a soon to be four year old a recipe book and tell him to choose which birthday cake he'd like!
Result: a castle
Problem: We need 12 mini-swiss rolls for the towers/turrets BUT DS1 has a nut allergy and every mini-swiss roll in our local shops may contain nut traces.
I have a nasty, very nasty, feeling that I'm going to have to make a swiss roll (as well as the birthday cake itself) and cut it down to size unless ... a smart Mumsnetter can come up with another solution!
I have (not altogether seriously) considered the cardboard tubes from a loo roll but ... couldn't bring myself to eat the cake if I did that!
Thanks!