Hello gents.
We have helped many car owners to relocate Tesla from Hong Kong to UK and Europe. Here is a few things.
1. Your SIm won't work, you will require to buy a local sim and swap it with the UK sim and update the APN. Sometimes it will work without updating.
2. Your Navigation will not work, you will need to either figure some ways to get Tesla to change the car into UK specs (But they won't do it at the moment)
3. SC and everything works just fine. Autopilot may works with internet access.
4. The charge port is exactly the same as HK and we have so far moved around 12 cars MS and MX and without any trouble.
If you have any more questions feel free to PM me. It is actually not so hard to import a Tesla to UK but you have to find someone who know what they are doing.