Thanks for your advice Stolly and Rozzer. After your encouraging comments I went for it and had a stonking time. It was bright and sunny (albeit very cold on PYG at 8am - so cold my iphone camera wouldn't work) and with all the snow still around it was stunningly beautiful. It was warm and quite spring like in the valleys. As I approached the steep climb on Ingleborough it looked like I'd need crampons and an ice axe and I would have been worried but for your advice. I got up without drama using the fence for balance (except for a small section where it was completely buried!) and the footsteps in the snow - in fact it was faster than clambering up the rocky path!