It sounds like when you buy an EV, you need to make sure you get a "granny lead" to go with it.  That way you at least keep the option of charging it off a 13A socket if your smart charger fails.

But I believe that the government is thinking of banning granny leads soon.  Not that it would stop people buying cheap ones off Aliexpress or similar.

A friend has a plug in hybrid. He used a granny lead and after a few weeks it stopped working, it had overheated the plug which had melted. He had a few choice words with the dealer and after weeks of chasing was told he needed to reduce the charge rate to 8A  by pressing a button on the charger a specified number of times. Looking on the web indicated a few other people had had the same problem.

A friend has a plug in hybrid. He used a granny lead and after a few weeks it stopped working, it had overheated the plug which had melted. He had a few choice words with the dealer and after weeks of chasing was told he needed to reduce the charge rate to 8A  by pressing a button on the charger a specified number of times. Looking on the web indicated a few other people had had the same problem.