Tomorrow sees the start of a big change in the way that Londoners watch TV.
Up until now, digital television has been offering viewers a wider selection of channels, but it has been an optional extra.
Now, however, it is going to become essential.
From tomorrow you will only be able to watch BBC2 if you have a digital television or an analogue TV with a digital set-top box.
Later this month, the second step in the switchover will affect all of the other analogue TV channels.
In the video below, Ben Scotchbrook outlines the six key points you need to know.
Some set-top boxes will prompt you to retune but most won’t.
In order to retune, just select the menu using your remote control, and select the ‘set up’ or ‘installation’ option. Then select the full retune option (sometimes called ‘first time installation’, ‘factory reset’, ‘default settings’ or ‘shipping conditions’).
Press ‘OK’ if you are prompted to delete all your channels. Channels will then be automatically installed and your equipment may shut down and restart.
You can find more information on the digitaluk website.