That's the right URL, Silvaire, which is why Rod1 was being disingenuous.
One has to get a permission from most countries in Europe, and more than most outside of Europe.
The 1980 agreement has been mostly ignored.
This doesn't bother the vast majority of UK pilots who never fly abroad, but often people come to GA wishing to fly to far away places, and they need to be made aware that some things they may do may give them cheaper flying in the UK but hassles flying abroad.
Also one needs to be aware that a large part of the advantage of an LAA type is the ability to do one's own maintenance. There is therefore a strong correlation between people flying those types, and people willing and able to do their own maintenance, get the spanners out and get their hands dirty. Some like that, some don't, but those who don't aren't going to save a lot of money.