"Out of interest how many people would recommend carry crampons up there? "
I do - I've been up a few times in winter and have always carried them (although haven't always used them). You don't need much ice on the summit ridge for the extra feeling of safety you get when wearing crampons to be worth the extra weight. Ditto the ice axe.
Re the weather - the Razorback can be a lonely place when you are caught half way along in bad weather/zero visibility. Always a good idea to be prepared for the worst (and to turn back, even on an "easy" hill like Feathertop).