At midnight, the digital television switchover commenced across the London TV region, serving almost 5m homes across the capital and surrounding counties.
Analogue BBC Two was turned off at Crystal Palace and other transmitters, marking the start of a process that will see digital terrestrial television (DTT) - commercially branded as Freeview - coverage increased to reach all areas.
From today, more than 400,000 viewers in former 'digital blackspots' across Greater London and the Home Counties will be able to access Freeview for the first time.
Homes already receiving Freeview will need to retune their set top boxes or integrated televisions in order to regain their BBC services, which will be missing this morning. This includes BT Vision and Top Up TV users, but cable and satellite customers will not be affected.
Freeview viewers will also notice that analogue ITV1 has moved to button two on the remote control, where BBC Two used to be, and it will remain there until being switched off with the rest of the analogue channels on April 18, when Freeview signals will boosted in their place.
From then, Channel 5 and further Freeview channels will be available from local transmitters across London for the first time.
Arqiva, the company that manages the UK's transmissions infrastructure, intends to mark the end of the switch on April 18 by illuminating Crystal Palace with 200,000 watts of lighting, sending brightly coloured beams firing out across the capital.
"At completion in October it will have involved more than 1,200 man years of effort and the construction of five new TV masts, one the height of 70 double decker buses.
"In only five years, we have transformed this vital public service into a modern platform that is delivering the best of British TV into over 20 million homes across the UK and meeting the evolving TV viewing needs of the UK population."
Deborah Bain, the London Manager for switchover body Digital UK, said today marks "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," she said.
"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."
As of last month, 940 TV transmitter stations had switched to digital, covering 11 out of the 15 UK regions and 63% of the population.
Due to its size, Crystal Palace will add a further 18% of coverage pretty much overnight. By the end of the final switchover in Northern Ireland on October 24, 98.5% of the British population will be able to access hundreds of TV and radio channels via Freeview.
Any eligible older and disabled people can still access assistance in upgrading their TV equipment to digital by calling the BBC-administered Digital Switchover Help Scheme on 0800 40 85 900.
> London to bid farewell to analogue TV - feature
View our gallery of images from the Crystal Palace transmitter in South London: