Well, the engineer turned up at about 8:45, had a look, tried swapping the scart cables round - having the cable out that should go to the video to the tv, and vice versa. The clicking stopped, but surprise surprise, it stopped auto-switching to the video when i press play
He then said we can solve this by getting rid of the scart cables, and connecting by the RF leads

! Wouldn't this reduce the picture quality me says..."well yes, a little bit....." A big

was my answer to that one, and so (albeit a little reluctantly) he switched me over to a 1000+ box, which means I now have the audio out connectors on the back

, but also means I've got to re-order all of the channles
Thanks for your replies everyone
A click free Mick