In reply to frankboase:
I've done a complete traverse of the Pyrenees using the GR10,HRP and GR11 over 4 holidays. Started off with fairly cheap kit .50litre sac about £50,Gelert 1 man tent £25 (like sleeping in a coffin) not tested in heavy rain, Gelert version of pocketrocket stove about £10, sleeping bag from Lidl £25 (these are brilliant for the price- 3 season but a bit heavy if youre trying to go extra light) . The changes over the next three years included a superlight 60 litre sac from gossamer gear £180 and upgraded the tent to a 1 man terra nova Zaphyros (1.5kg) £140, Katoola crampons £45, and dbs of inflatable mats at £130 (need a bit of comfort for my old bones). Last 2 years I've used a 2 season bag a bit cold at 2300m in July (lots of snow around late last year. It seems the lighter you go the more you've got to pay.