Further about the iPlayer bigscreen:  To exit the fullscreen video in Linux I have now corrected the irxevent command from Esc to Escape which works (Alt-F4 was the Windows command, sorry).  Using the Lirc-mouse I can even reach the buttons at the bottom of the fullscreen video for Pause, Restart etc, and at the start page the lirc-mouse lets me choose a different tab (such as the TV tab).  Cannot do any of this in Windows (can move to different tabs but not enter them).
So in Linux I am very pleased about the bigscreen.  Have not yet found a good way to exit the iPlayer in Linux except using the lirc-mouse to either of the top corners of the screen.
Cheers, Krister