The beauty of an extension cable (whils’t no the be all and end all), is it won’t invalidate the chargers warranty and will get you out of a fix relatively cheaply however, I would stick with a maximum 5m extension.
Would this be suitable please? Also thanks for your help. RamTouch EV Charger Extension Cable (32 Amp, 7.4 kW, 5 m, 1 Phase), Type 2 Extension Cable Compatible with all Type 2 EV Chargers & Type 2 Wallbox, EV Extension Cord Suitable for Type 2 EVs/PHEVs : Amazon.co.uk: Automotive
There is no mention of ip rating, I can see which I would be dubious of, especially as an extension cable., unless you can come up with a solution of covering the connection when it rains, such as a weatherproof box?
Using amalgamating tape could be a longterm solution, if you kept both cables connected!
