You may need to upgrade your TV aerial in readiness for the Digital TV switchover, an on this page you can find links to local aerial installers all over the UK.
The digital switchover is split into the 14 TV regions of the UK; from North to South they are STV North (Scottish Highlands (except Fort William and Lochaber which are STV), Inverness, Aberdeen, Dundee and parts of north Fife), STV Central (central Scotland), Ulster (Northern Ireland), Border (south of Scotland, much of Cumbria and the Isle of Man), Tyne Tees (north east England), Granada (Manchester, Preston, Liverpool and Cheshire), Yorkshire (Harrogate, Leeds, Sheffield, with Hull in Humberside, Lincolnshire and parts of Norfolk), Wales (from Anglesey and Wrexham down to Swansea and Cardiff), Central (Birmingham and Nottingham down to Oxfordshire in the south), Anglia (most of Norfolk, Suffolk, parts of Essex, Cambridgeshire, Northamptonshire and Hertfordshire), London, West Country (Devon, Cornwall and parts of Somerset and Dorset), West (Cheltenham in Gloucestershire down through Bristol to Taunton) and Meridian (Kent, Sussex, Hampshire, Berkshire, Surrey, Wiltshire and the Isle of Wight).