and post the results, there may be a routing problem between your ISP and the web site ... I'm assuming IMDB is the only site you're having problems with.
Sometime for some strange reason I have not been able to get in on the site to the title page so gone in through an other route if the above does not work try this here
NTL .. I might have known .. I'm on NTL but a different region. They use transparent proxies to 'help' speed up web browsing, trouble is by and large NTL employee a team of muppets to configure these things and it's not unusual to have web sites disappear.
Best I can suggest is wander over to NTHellWorld (the non-NTL-owned version) and Search for 'proxy', sadly you'll find loads of comments about this and some suggested solutions.