I think I've nailed it - the BP Chargemsster socket seemed to need turning off and on again.
It turned out that the 13 Amp socket at home didn't work because of a faulty extension lead.
Remove that data from the problem and the only socket that didn't work was the BP one at home. Two fast...
I recently bought a new 2019 leaf and it has been faultless until the weekend.
I can't get the car to charge. I took the car to the Nissan garage (about 2 miles away) and of course it charges fine. Plugged it in at home and nothing. Blue dash lights flash for about 5 minutes and then nothing...