The lion in the middle is British South Africa Police (Rhodesia)
The large helmet plate is for Essex Constabulary, worn on the front of the usual blue beat helmet ( Essex police helmets also have an additional 'comb' on the top).
The SC with crown is Metropolitan Police Special Constable (SC) and worn on the eppaulette or collar - it's pre 1953.
The single crown is likely a Superintendent eppaulette or collar badge of rank.
The others are mostly self explanatory I think.
Regards all
Bess
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