Welcome to NTHW craggle nice to meet you.
If you do a search for "proxy" using the link on the top bar on this page you will find this is a popular topic here, largely as a result of the "poxy" proxies used by NTL.
If using the Peterborough proxies is causing any issues for you the other threads will give you all the info you need to sort this.
Or you can browse the detailed info in our ntli.info section on the subject:
http://www.ntli.info/index.php?page=index_v2&id=12&c=8
Hope that helps.