Portsmouth 24, RV6382, was the final one of the 1935 batch of AEC 661T/English Electric H26/24R trolleybuses.
It was exhibited at the Commercial Motor Show at Olympia from 7-16 November 1935 and did not enter service until 4/36. It had a different trolley gantry to the others in the batch.
Is this a posed shot? The smartly dressed gentleman with his foot on the platform is looking directly at the photographer rather than where he is going.

Photographer unknown, AEC Official Photo (the late Roger Janes Collection), April 1936, St.Mary's Church, Fratton Road, Portsmouth

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