Regarding the charger, and the most recent comments regarding this, I am going to have one installed. Frustratingly this is going to cost a lot more than just £749, more like 1100-1400 but feel free to keep making assumptions. These quotes have come from both big names (PodPoint, Ohme, Octopus) and local installers, and mostly arise due to it being slightly more complex (sub-floor boards and secondary CU at least) so I’d have been paying extra on a Motability installation anyway, which I already knew.
If your consumer unit is on an outside wall (most are), it is easier and less disruptive to run cable externally.
No where in the regs state, you must use a secondary CU, to supply the charge point. If your existing CU has a spare way on the non RCD side, as 40A type A RCBO can be used and a SPD can be fitted next or near to the CU, affording you full house protection, rather than protecting the charger from surge’s.
Chargers, such as, Hydra Cubis, BG Sync, Project EV etc are much cheaper but, just as good, as the big named brands.
If you wan’t cheaper, an interlocked commando (CEE) socket, can be installed from as little as £300 and use your cars onboard schedule settings, to program timed charges.