My garage was built in 2010 and I lacked foresight. It is supplied by a 20m long 4mm three core SWA cable, buried in ground. I have run two EV charge points for the last few years but both current cars draw only ~3.3 kW. I am about to swap one car to something that will draw 7kW so I now need ~48A which exceeds my hardware capabilities. I would prefer to future proof to allow two 7kW charge points at a total of 64A. The original cable route is no longer available (expensive paving) but I have the option of a new 24m route. Rather than bin the existing cable and install an expensive and difficult to handle 10mm or 16mm SWA I thought I might run a new 6mm SWA connected in parallel with the old 4mm one. That would give me a greater current capacity than a single 10mm cable. I am aware of guidance regarding matched cable types and lengths in parallel power cable setups and issues with unmatched cable currents, reactance issues if cables are not in matched electromagnetic environments etc but most of this pertains to three phase and very high current situations. Does any of this matter for my proposed setup?