Hi Jonoro. Fingers crossed it does seem okay now. The problem was that it would display D 9 constantly. Trying to change the channel using the remote had no effect. I tried another remote (I have three Panasonic Blu Ray recorders which are great machines but very sadly not being updated by Panasonic now) but that also produced no channel change. Retuning did not help but disconnecting it from the mains supply for a couple of days seemed to cure it.
Thanks for your thoughts and your interest.