I’ve been away (hence the delay in replying previously) and I thought I’d double check the machine and very strangely it’s now working. I ran a 30 minute wash cycle, then a 40° wool cycle and no issues (next I might try with clothes in). I’ll keep an eye on things and hopefully it will continue to work. In answer to your last question, no child lock on the machine and there was no flashing light sequence when it was playing up, just the start/pause light flashing green.