Firstly, the image you quoted and the figures you are quoting are from the US website. The guy you have quoted is also from the US. I don't know what the regulations are there, but you can't "get your electrician" to double your grid feed in the UK without breaking the law. It is not the homeowners property.
Secondly, if you have a Dual Charger equipped Model S it can accept up to 22 kW.
Thirdly, you can draw 22 kW from 230V if you want (you could also draw it from 10V if you fancied it). However, virtually zero homes in the UK are equipped to do that without modification to both the home and the external power supply, whether that be to maximum currents, voltages, phases etc.
A Tesla Model S at 22 kW is not plug and play in the UK at all, and *will* require expensive modifications.