Hi Just did a road trip with the family from Northampton to scotland on our MX and can confirm only used tesla supercharger once due to last resort. I have so far done around 835 miles and only used public chargers.
So far i did Northampton to Hamilton park, glasgow, Balmoral castle, perth, Edinburgh, newcastle(currently writing this from an hotel room in newcastle) and heading back to northampton tomorrow morning.
I have an ID4 so i used the we charge app at discounted prices which cost me around 27p per kwh. I made a special layer of maps on my google maps showing me rapid chargers across uk and at discounted rate that are compatible with the we charge app.
The chargers that i used were, Ionity, chargemaster, fastned and shell recharge and all working perfectly with no issues whatsoever.
Here is an image that permanently show on my google maps of chargers...
I don't mind sharing the chargers with anyone else who who thinks it might be useful to them?
All the chargers i listed above and more are under elli membership provided by VW and membership is £12.99 a month and gives access to all chargers under 35p per kwh.