At midnight on April 4, the 219-feet high Crystal Palace transmitter – which brings TV to 4,858,000 households in London and the surrounding counties – will begin the switchover.

BBC Two will disappear first, and the rest of the analogue channels will follow on April 18, with digital terrestrial television – aka Freeview – in their place.

When the switchover is complete on April 18, transmission firm Arqiva plans to light up the tower and send 200,000 watts of brightly coloured beams across the capital.

The move comes 75 years after London got its first regular TV service and will affect an estimated 12 million viewers in the London area.

The majority of homes have already switched over to digital, but Digital UK believes thousands of analogue TVs in the area still need to be converted.

The broadcasting organisation has estimated that over half of viewers in the London area plan to buy a new television and concerns have been raised over people dumping their old ones.