"BT is currently rolling out a next-generation network in the UK using fibre-optic technology, which is capable of higher speeds than copper-based ADSL2+, and aims to have 40 per cent of UK homes connected in time for the 2012 Olympics."
http://www.webuser.co.uk/news/top-stories/451075/orange-to-give-llu-network-back-to-bt