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I'm sorry but had a MAGIC moment last night the Model is HUMAX PVR-9300T and yes should have been record not tape.
What happened was that if you tried to record a half hour programme say at 2030 it said you could not record citing 2 programmes that were not due to record until 2100. Even trying to use +1 programmes the same thing was happening. A programme I had recorded late Sat had recorded OK but a non BBC had not. The guide was showing correct time but it looked as if somewhere along the line the clock's forward had not been done