Sorry, I wasn't very clear

I have no problem logging onto Mudcat as a Guest from work though VW Group's servers.

It's when I am at home logging on through my home ISP (the dreaded talktalk)that I get 403 Forbidden. I'm not aware of any "nanny" program or ISP settings being applied. Maybe I should see if I get the same if I try to access some genuinely dirty websites :-). Any suggestions?

That said I was able to connect to Mudcat fine last night.