In the 1960s and 70s most services featured on the front of several postcards which were issued by the operator to celebrate and promote their services. This wasn't unique to services: other postcards were available showing various sections of the M6, and many towns would include a photo of their local motorway on postcards.
The novelty wore off as motorways and services became busier and more common. Many of these are now pretty rare, some of them can be seen on this site.
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