Managed to catch them on the North York Moors as planned. Started off cloudy and dry but ended up very wet and dull but an impressive turnout of cars nonetheless.
At one point I was kneeling down in the heather taking pictures in heavy rain (fully kitted up of course - I'm used to walking there!) but I did get a few quizzical looks from car occupants travelling in the opposite direction!
So a couple of batches of photos: