To answer a few things, I couldn't open the bonnet to get to the release wire. Nobody seemed to know about the bonnet release in the driver footwell. The lock on of the connector I think is controlled by the car. Eventually either something timed out or I locked and unlocked the car enough times to get it to release. I am now a veteran of 4 different pump suppliers and have even had charges off 3 of them. Locking and unlocking once the charge has been stopped seems to free the connector, even when the pump seems to have lost the plot. The whole payment process is a mess, though, especially if the pumps are away from shelter and it's raining. Out of interest I managed to use 240 miles of estimated range on 220 miles actual, on a mostly motorway 70mph journey with heaters and lights. This is rather better than I have been doing on lots of short journeys where the yield is only about 75-80% actual to estimate.