EV cable shop
The extension posted is only rated to 16a and a max of 3.6kw. They don’t seem to have any of the 32a or 7.2kw in the 5m cables, they are sold out.
https://www.evcableshop.co.uk/search?q=Type+2+to+Type+2+-+EV+Extension+Cable&type=product
EX30 SMER Ultra