Just to add that I had the new skates sharpened at a reputable shop to a 5/8" hollow, as before, but the difference is significant, I am much more stable now, only fell once last session, when trying a tricky move, I normally fall many times. Guildford rink seem to have done several poor sharpens on my skates. I had the old ones checked, and the left one had almost no outside edge, no wonder my foot would sometimes slide sideways without any effort.