So many networks and locations are truly not fit for purpose and some people’s attitudes to queuing and treatment of the equipment/charging curve is very poor.
It is a shame you haven't had a chance to use the new motorway network with the Gridserve upgrades, they are much better than who Ecotricity were running them, still too few chargers overall, but a huge improvement over what they were offering, so much so I no longer just default to Instavolt etc. always tried to avoid BP NewNameWeekly as they never struck me a well placed and looked after network.
As for the queuing, only had this once and the person who was charging said they'd disconnect and let me on, since they already had enough to get home. I am sure it will get worse before it gets better, and since you only do long trips and no commuting then it almost seems pointless having a car, would it not be cheaper to hire one for the days you need one?