I would have pointed out the large amounts of electricity they supply to us usually. But that will all have to go to the rest of the EU, especially Germany, once they stop buying so much Russian energy. In fact it looks like the UK has a surplus of gas right now (make up your own jokes, in the Boris thread if need be).
The rest of your post I agree with. Like you I find it sad that such a beautiful country and people, with so much in common with us in every way, seems to have such a political chip on their shoulder. With each other as much as with us it seems.