Freeview viewers are being reminded to retune their TVs as the digital switchover begins today.

Last night, analogue BBC Two was turned off at Crystal Palace and other transmitters across the region, marking the start of a process which will see Freeview coverage boosted to reach all areas.

From today, more than 400,000 viewers who were in former digital blackspots will be able to receive Freeview channels for the first time.

Those homes already watching Freeview will need to retune their TVs and boxes in order to regain their BBC services, which are now missing.

The digital switchover will be completed in London on April 18, when the remaining analogue channels will be switched off.

Channel 5 and further Freeview channels from ITV and Channel 4 will then be available from local transmitters for the first time.

Switchover roadshows are running today and tomorrow in Croydon.

Older and disabled people who are eligible for the Switchover Help Scheme are still able to submit applications for help in converting their televisions.

For those who have already signed up, the Help Scheme call centre is available to help on 0800 40 85 900.

Deborah Bain, London Manager for Digital UK, said: "This is the biggest day for TV in London since Crystal Palace started broadcasting 56 years ago.

"From today, thousands of viewers across the capital and beyond can receive more channels and better quality pictures.

"Anyone who still hasn't switched to digital should prepare for April 18 when the last analogue channels will be permanently switched off.

"We urge everyone to get ready now- don't leave it until the last minute."