For anyone who isn't aware - NTL have upgraded the speeds of their broadband packages.
300k goes to 1Meg
750K goes to 2Meg
1.5Meg goes to 3Meg.
HOWEVER they've now introduced caps on the amount you can download (1Gig a day for the 2 + 3 Meg services, 3Gig a month for the 1Meg service).
It was supposed to have been automatic (except for the 300k) but isn't. You can manually do it yourself though by going to the ntlworld site, clicking on broadband and then choosing the upgrade option.
Takes a short while after activation (10-15 minutes) but you should notice an improvement