grahamlthompson
A further thought.
If I had given it much thought I would have assumed that when recording the unit would update the EPG so with a number of regular record entries each week we were away the EPG would have kept upto date. But it looks as if when in record mode from standby the unit does not update the EPG, it is required to be switched on to do so. So recordings are terminated - 43 minutes must represent a recording limit in the software in the absence of an EPG finish time.
Of course, there is nothing in the manual to indicate this shortcoming.
We had seen odd programmmes not recorded or only 43 minutes recorded previously but never been able to identify a cause - I even considered returning the unit as it was in guarantee but was reluctant to lose the recordings we had on it. It was only when viewing the recordings for a 10 episode series we started recording before going on holiday which continued after we got back that it was obvious the 43 minute recording were only whilst we were away, either side of our holiday we had the full 60 minute recordings.
So, thank you for your help, the Power On/Off solution should be the answer.