[JontyG]

I see what you mean.
To get around this - and bear with me cos its a bit long winded
instead of pausing ITV, hit record. You could then set BBC to record from the EPG. To return to ITV where you left off, go to your recorded programs and select it from there. Although the program is still recording, you can watch this from the HDD at the same time.

Should get the desired effect