Thanks for the suggestions. I was hoping there might have been a menu option to turn interactive services off, that I'd missed. Does deleting channel 105 take the red button off or take away one of the interactive channels? The way I do it on my other PVR (which has interactive services off by menu option), is select ch 301 manually if I want to watch the interactive feed.
The only time I use the Red Button is on my Freesat PVR to access iPlayer or the Red Button streams. Very occasionally on the TV to access weather and news. Fortunately it can be (and is) turned off permanently on my older Freeview PVRs. No need for its old and clunky way of finding out things when you have a laptop always to hand