Fresh in green livery in around 1960, would this be a Severn Valley service?
Peter Kerslake says "This example, with its angular and wedge shaped ends, was constructed at Swindon, the last of the fourteen built there in 1940 and was based at Worcester in the mid 'fifties, one of six there in 1956, the most to have been allocated to one depot at that time although both Reading, Southall and Bristol all had five each on their respective books."