The map below shows the 14 TV areas of the UK and which year each area is expecting to switch off the analogue TV signal.
The first area of Wales to be switched to digital only will be Swansea, on August 12th 2009. A week later the switchover will spread to the west of Swansea and then parts of central and south Wales will switch on the 26th August. So it's the end of the line for the analogue transmitters at Kilvey Hill (12th August) Preseli (18th) and the Carmel transmitter (26th August) and the old analogue TV signal is expected to be switched off altogether in Wales by 2010.
The main government website for the switchover is Digital UK, and there are many specialist help areas too, such as information on the Digital Switchover Help Scheme which can provide free installation and equipment to people over 75 and those with certain disabilities.