I recently got back from a trip back to the UK. Every time I go back these days something about the country has fundamentally changed. This time it's that every petrol station and motorway services has a Marks & Spencer or Waitrose supermarket embedded in it. On the motorway there are generally several large branches, and then a smaller branch in the toilet hand-washing area, and finally a tiny shop selling sandwiches and a small selection of ready-made curries in each cubicle.
At first pass this seems very convenient, but you can't fill up the tank in the smallest BP (paying at the pump being virtually unheard of in the UK) without getting stuck behind someone doing their weekly shop.