Tesla are offering for all cars build before June 2019 a CCS upgrade.This consists of a ECU upgrade under the rear seats,some cabling and an adapter.

The whole upgrade can be carried out by a Mobile Technician and the price has just been dropped in August 2020 to £280 inclusive VAT.

My upgrade was carried out in November 2019 and you can see that it is working great on Instavolt chargers and also Tesla Version 3 chargers.