garden plug outlets should have an appropriate breaker on them for whatever they’re rated at… you can use them for whatever you like: they’re no different from an inside plug other than being weather proofed… why would they be any different? old extension leads are also fine for charging a car, as long as the insulation is fine and they’re rated the same as the breaker… again, why would they not be? its not like extension lead technology has exactly changed much: it’s a chunk of copper surrounded by non-conductive material

it doesn’t become a fire risk simply because it’s old…