RED COMMODORE at Clacton Pier. A screen shot from "Five Minutes by the sea at Clacton" film from 1950, available online at player.bfi.org.uk/free/film/watch-five-minutes-by-the-sea-at-clacton-1950-online.

RED COMMODORE was a converted Royal Navy Fairmile 'B' Motor Launch, built Bangor 1942 as RML537. She was one of many that came onto the market after WW2. Broken up October 1952.
From 1947 she had operated in the Channel Islands and there is a history of her time there at www.channelislandsshipping.je/page87.html
Date: c1950