In reply to BarrySW19:
Mountain Equipment have absolutely fantastic customer service, which is one of the reasons i'm usually covered head to toe in the stuff. I've only ever had to return two things, both times with very little fuss on their end. Once, they repaired free of charge, and the other was replaced with a brand new top of the range model. (Didn't have the receipt for one, but did for the other)
I worked in Ellis brighams a few years back and ME were the most frequent manufacturer to repair/replace any honest faults (not people blagging stuff). Go in and explain, and i'm sure they will be able to help.
Good luck, i'm sure they'll sort it for you.