That was it - they were Apple Green chargers. And you are also correct in that the Gridserve had someone drawing juice hence why it didn't work. Where do you learn all this lol? The lady who was connected to the Gridserve didn't say a word as she sat in the car next to me watching countless people try.
I just remember gridserve making a point about it when they installed them. It’s a shame the software on the charger itself doesn’t make that abundantly clear.
Your right about hardly anyone knowing about it because I was on a gridserve unit on Friday on the M20 and an EV6 owner was trying to use the other plug and then was waiting for me to get back.
There there was 6 ionity units round the corner they could have used if they really needed a charge (to be fair I didn’t know they were there until I was driving out). I only went on the gridserve units as they were both empty and it was an unplanned pee stop and was planning on using the super chargers at Folkestone but my bladder range wasn’t quite there!