OK, i think i may have your answer, and Pem, prepare to eat thy words....

(If not Doh!

)
If i try to use any of the following...
cache2-brtn.server.ntli.net
cache3-brtn.server.ntli.net
cache4-brtn.server.ntli.net
Its works fine, but cache4 seems to be a bit slower, cache2 seems to be the best at the moment.
HOWEVER.....
cache1-brtn.server.ntli.net
REALLY bad... 404's more often than not and only occasionally connects. So i think thats the problem.
Peeps - if you want to run even faster change from what i said earlier from cache4 to cache2.