I had read some time ago that non-Tesla electric vehicles could use some selected Tesla superchargers. Alas none in the Bristol area can be used, so I’ve never had the chance to try them out. As well as using the chargers at Studlands Retail Park in Newmarket in Suffolk, I also used the Tesla chargers at the westbound Reading Services on the M4.
They use to have a couple of Gridserve chargers for electric vehicles, they have since expanded the provision to fourteen Gridserve chargers and twelve Tesla superchargers. There are an additional four BP Pulse chargers at the petrol stations as well.
When I arrived at the services I was not the only interloper (non-Tesla) electric vehicle to use the Tesla chargers, there was a BMW as well.
I found it interesting that these Tesla chargers are opposite the Gridserve chargers. The Gridserve chargers are 20-30p a kWh more expensive than the Tesla chargers. I used the Tesla chargers there, as it was easy through the app (and cheaper than the Gridserve chargers.