One of the Fiat 500 clubs has been touring around and I think they were as far as south-west Scotland last week. They came up via The Lake District so it could be them on the way back down the east side of the country.
As fiat500 said it is the Fiat 500 Club UK. They are on their way back down south after a tour away in the Lake District and Scotland. There are 5 500's on the tour.