Recently returned from Cornwall. Darts farm Exeter was showing full for most of my journey on a Saturday. Stopped at Lifton at lunchtime for a quick halt and volt. All occupied but no Queue. Had to wait 5 minutes for a slot and then only 50kwh due to power sharing. 4 more model 3's showed up while I was there so I imagine some people were in for quite a long stop. All of which will surprise absolutely nobody familiar with that part of the country.
Bristol is an interesting one now if coming down the M5. You have a choice of Gordano 8xV2, Lysander road 6xV2, Cribbs 2xV2 + 12xV3.
Gordano tends to be very busy and not just the superchargers just getting to the services can be a challenge and then the shared V2 will be full and slow.
Lysander is pretty accessible from the motorway but no facilities so not great for a stop on a road trip.
Cribbs is in some ways a better choice if its busy with its 12xV3 and big choice of places to eat. The only problem is by the time you have gone to the toilet and sat down at a restaurant the car will be charged you will have to go back to the carpark to unplug. #firstworldproblems
fine if you are doing fast food though. It was where I stopped on the way back and was pretty quiet, chargers and dining.
Another option is the new Mollies American Diner just off the M5 at Cribbs. 5x50kw Gridserve in the carpark which is fast enough if you are having a sit down meal.
I actually stopped at the new Mollies Motel attached to the diner on my way down to Cornwall to give me an early start on the Saturday .£65 for an airconditioned room and 8 free 3phase AC chargers in the carpark so 11kw in an M3. Now THAT's how it ought to be. Highly recommended