Other Services On this Motorway:

Heston
Reading
Cheively
Membury
Leigh Delamere
Aust (Severn View)
Sarn
Magor

Cardiff Gate
Cardiff West
Swansea
Pont Abraham

Other Pages:
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Trivia:
For the first 5 years of its life, Sarn operated out of old army nissen huts

Originally the first motorway service area on the M4 after you enter Wales from England- a long distance of 75 miles. Now two other services are en-route (Cardiff West and Magor).