BT has added a further 63 local branch exchanges to its fibre optic network and said it is on target to complete rollout to 40 per cent of the country by 2012.

This is the fourth phase of the network's rollout, and areas covered include Royal Albert Dock in London, Didcot in Oxfordshire and Blunsdon in Wiltshire.

Fibre optic broadband is now installed at 161 exchanges. The rollout, dubbed 21CN, will provide users with speeds of up to 100Mbit/s.

BT's wholesale agreement says that its partners will benefit from the infrastructure, and can provide "superfast" broadband under their own brand.

For a full list of exchanges click here.