Avoid Tesla approved electricians they will rip you off and I speak from experience.
I won’t mention names but I had two approved installers visit and quote, both wanted in excess of £300 to install a TWC on s that ontop of the £400 for the charger.
I did some shopping around found a local sparkle who charged me less than £100 to install.
Due to my odd setup my install was different in that I sourced, paid and installed my own cable all 50meters Of amounted cable the sparkle just connected one end to the consumer unit and the other to the TWC.
I was shocked when these so called approved installers wanted so much more, rip off, I think some see your getting a Tesla and they think it’s an excuse to charge you more