In message , at
09:10:18 on Sun, 25 Nov 2012, Portsmouth Rider
remarked:
Head - desk The only vehicle that is allowed to stop at a bus stop is a
bus on a service licenced to use that stop.

Cars and vans are allowed to stop there as well. Only if there's a "No
Stopping" plate is a bus stop exclusively for the use of buses.

See Highway Code Rule 243.

That's a "Do Not", rather than a "MUST NOT".
--
Roland Perry