Up, down, left, right - move the highlight bar in menus 
and in the programme guide, and allow you to browse
the channels and programmes.
Selects the option in a menu.
Displays the channel list.
Displays the programme guide.
Exits a menu and returns to the main menu.
Exits a menu and returns to normal TV viewing.
Opens YouTube
Turns the volume up and down.
Switches to the next or previous channel. Moves one page 
up or down in the channel list and programme guide..
Turns on or off audio description.
Switches between available screen display modes.
Turns on or off subtitles.
Displays interactive and digital text services (where available).
Red, green, yellow, blue – Chooses
options within menus.
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