Tillyman there could be something in what you said. Before the charger was installed I would use the 3 pin all the time and I regularly let the battery go down to 20 or so miles and in hindsight I was getting around 260 then compared to 240 now.
Tbh it doesn’t really annoy me as 240 is good, I just wouldn’t mind getting 300+
I’m heading away again next week to rural Donegal. I’ll probably do about 300 miles there and back. There’s a 50kw charger in Killybegs which is beside where I’m staying and which is just behind a big beautiful fishing harbour and in front of several nice bars and restaurants. So I’ll be forced to charge there lol.