I've just been reading my ISP status page and it seems there are ongoing issues with one of the Telehouse data centres in London, where a lot of ISP's (mine included) have routers and other connection equipment located. Problems started Fri/Sat.
I've was booted off my ISP (Plus.net) a few hours ago for 20mins, as they lost all connectivity to the Telehouse datacentres in London.
Some of the transit peers such as Linx and Level 3 which basically handle all the UK's internet traffic are also having ongoing problems, hence the reason why some users on different ISP's cannot currently access some web sites both based in and outside the UK.
Regards
Regards
James Mitchell