I am half welsh too, probably why I like wellies and sheep !
My experience abroad having been stopped twice by police is yes they fecking do enforce on the spot ! They get their money full stop.And they are armed, and there is a second man covering you ready with a gun. Thats not how our police generally work.
But I respect foreign traffic laws, because of it . We do need to get tough and collect on the spot from foreign plated drivers. With anpr I am surprised why we let any through the net. They dont pay road tax here,or any short term tax like a vignette. So why not ???