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4 April 2012, 11:32 | Updated: 4 April 2012, 11:34
The Digital TV switchover is underway for people across Watford, Hemel Hempstead and St Albans.
It began in the early hours of Wednesday 4 April 2012, when the old analogue BBC2 channel was switched off in the London TV region.
The rest of the old analogue channels are due to be switched off two weeks later, in the early hours of Wednesday 18 April.
The change means anyone still watching a TV that only receives five or fewer channels has begun to lose them. People who have already gone digital with Freeview will need to do a full re-tune on both 4 April and 18 April to avoid losing digital channels, which will move around as part of this process.
People with satellite or cable services, like Sky or Virgin Media, are unaffected by Switchover.