The only time I used a Granny was when we got the MG4 and before our Ohme Home Pro was installed. I have an MK Masterseal outside on the drive that I ran as a 16A radial using a length of 1.5 butyl heat resistant cable that I had left over from installing immersion heaters. I installed it as a GP outdoor socket for garden tools, lawnmower etc, well before we decided to get an EV.

We used it a lot in the early days and I did check the plug and socket every time, but didn't notice any issues.
 
And a big dollop of luck.
I know you're cynical. I'm just answering Coulomb's query about British Standards.

Hager make a 13A EV charging specific socket.
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Chop off your potentially dodgy plug and replace it with an MK646 plug. I should have mentioned these earlier. They are very robust and a reliable plug to use at higher currents.

I don't know about these days, but back in the day, organisations like the PO (and then BT), the BBC, Granada and even the MoD, just to name a few, used to swear by them and all had their marks moulded or printed on the tops of the plugs in place of the MK logo.

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Do check though before you chop off the plug that it hasn't hot a temperature sensor built in.
The lead is normally quite large and will say something like...3G X 2.5 + 2G X1.5 printed or moulded into the cable. This indicates 5 wires, the 2.5 mm sq being the main power conductors and the 1.5mm sq are the two wires for the sensor.
 
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