Thanks Don I will do like you say and put a few holes in the flash it may stop any overheating, I am quite surprised how powerful the little pop up is but I wouldn't want to rely on it. The slave flash I found was to harsh pointing straight ahead even on a 1/4 power it was much better with the diffuser. I am going to make a proper diffuser out of a white plastic milk carton, the one I used was made out of the box I get my photo paper in, I don't like to buying something if I can make it.
Christine