Many BBC IPTV applications use a progressive reveal pattern. The example below shows the progressive reveal starting from the bottom of the TV screen. This may not be relevant or necessary for all BBC applications.
First level interaction
Reveals the first level interface element and takes up no more than a third of the screen. It's important to show a partial reveal on first press so users don't lose their orientation on the screen..
Second level interaction
Reveals a second level of content and takes up no more than two thirds of the screen.
Third level interaction
Reveals the third level interface element. By this stage the user has committed to a task and the gradual departure from the programme being viewed will help keep them oriented. This may take up the entire screen or leave a small area exposed.