I changed my proxy to "cache1-bstl.server.ntli.net" which is one of the Bristol ones and it seems to work fine now.
AARRGHH!!! Why do we have to play musical proxies everytime we want to access a certain site???

@ ntl for these bloody proxies!
Top brass at ntl if you are reading - at least make 'em work if you want to have them, otherwise ditch them. Nuff said.
EDIT - Actually, scratch that. Ditch them alltogether.
It's all gone screwy again . . .
Time to move onto the next proxy. Today's question - how many proxy changes is it going to take before I can complete my bloody Ebay transaction?