Just for info from the web
'Don't miss out on Britain's best-loved drama. Whether it's a series you enjoyed first time around or a TV drama you missed that you're keen to catch from the start in its entirety.
Drama brings you the nation's favourite series so you need never be stuck for programmes to enthral you. If you don't have Drama at Freeview channel 20 you may need to retune your Freeview TV or box.
What do I need to do?
On your remote, press the menu button.
Select the 'set up' or 'installation' option. If you see picture icons, select the tool box, satellite dish or spanner. If you are prompted for a code, try 0000 or 1234.
Select the full retune option. This may be called 'first time installation', 'factory reset', 'default settings' or 'shipping conditions'. Do not select 'channel update' or 'add channels'.