Rhodgie, I’ve driven that same route fantastic roads and scenery, last weekend we did 640 miles with one service break on one tank of fuel and noted on the Thurrock M25 Services not a single charge point was free.
There were 6 for around 500 parking bays.
That was with my scooter my wife’s chair luggage on board with 4 adults and my grandson in his car seat.
This is the problem I have nothing available on the scheme comes close to what we need.