BT Wholesale provides wholesale broadband products to most of the UK’s ISPs. WBC (ADSL2+) is an enhanced version of ADSL that dynamically tries to find the best ‘stable’ speed for your line and is capable of delivering download speeds of up to 24Mbps and uploads of up to 1.4Mbps. Consumers should expect to receive significantly less than the top speeds above.

See our broadband page for a more detailed explanation:
http://www.ispreview.co.uk/broadband.shtml#3