Where was this a Coronation street party?

Who are they and where were they celebrating in 1953?
Who are they and where were they celebrating in 1953?
The telegram received by William Halls mother  still upsetting to read 78 years on.

NOSTALGIA WITH BOB HIND: Curse of the telegram: Dear Mrs Hall – your son is dead

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A Coronation street party somewhere in Portsmouth.

But who are they and where were they celebrating in 1953?