I'd agree with your first sentence 110% Iain, Peris 2006 was a mother. All to play for in the British, nd high 20s, no wind and no cloud.
Wasdale's certainly harder than Jura, streets apart. But Peris? Not so sure - a bit longer and a bit more climbing, but apart from Pen Y Pass hardly any water en route (loads of streams yesterday esp between the road and Gable) and from Y Lliwedd to the finish is probaly the harding bit of fell racing I've done.