I'm guessing this is an AEC Merlin from its similarity to a Britbus
model. It was in the range from 1971 to 1977, always in the same Red
Arrow livery and on this route. The variations come in the packaging. It
is also found as a self-assembly kit.
The doors open and it has a bell.
This Dinky was sourced from UK Toy & Model Auctions in March 2015