SWMBO complained a couple of days back that I had deleted either the results or the original competition of one of those dancy things - definitely on ITV. She further complained that not only had I deleted the recorded programme before she'd watched it, but had also removed the reservation from the SR schedule. I checked and, sure enough, neither recording nor schedule were present - altho the other 'half' of the show (ie either original dancing or results - sorry I cannae remember which!

) was still showing.
So I went forward six days on the programme guide and added the missing prog back into reservations. Checked and, yes, there it was reinstated on the schedule OK, but, wondrous to relate, the missing
recorded programme from the day before now
reappeared on the recorded progs list and, yes, played perfectly OK.
FWIW I have at some time recently unplugged Humax from wall to fiddle around with cables, so son_t's 'power off' condition might apply.
Barry