http://www.hongkongflotillaassociation.co.uk/index.html
Here's their introduction:
When the Far East Fleet moved to Singapore in the late 1940’s, Hong Kong was left with a small unit of the Royal Navy. They were to be called "The Hong Kong Flotilla"
This flotilla consisted of 10 Seaward Defence Launches, 4 Motor Minesweepers, Inshore Minesweepers and 8 Landing Craft Assault these craft were based at H.M.S. Tamar, or at the Small Ships Maintenance Based in Kowloon.
The purpose of the flotilla was to assist the Hong Kong Government and the local police force in controlling smuggling illegal immigrants and generally "showing the flag" for good relations, not an easy task at anytime.
In 1999 the Hong Kong Flotilla Association was formed. Former Officers and ratings created the association with the sole purpose of finding old shipmates. To date over 120 have been found, some not having seen each other for 45 years!
They also have a good selection of photographs of Hong Kong in the 1950s: