Thanks for the response Bob.
So does that mean in order for the Bluray to stay on with the lounge TV off, my bedroom TV would have to be connected via HDMI port as opposed to the AV feed it's currently receiving?
Agh! I thought I'd do a check before posting this and found my bedroom TV doesn't support the resolution from the Bluray, well, via AV anyway. Would need a 10m HDMI cable to try that.
Thanks anyway Bob.