A blue sign with symbols indicating services such as fuel, toilets and food, and the following text.
Services operator: GREGGS BK COSTA.
Services name: Gwasanaethau; Gorllewin Abertawe; Swansea West.
These services are actually the second on the M4 - the first were at Pont Abraham where we started - and the route is busy enough to mean we'll be passing opportunities to refuel with increasing frequency all the way to London.