There IS a street by the name of Old Gloucester Street in Central London, but the rest of the address doesn't sound right - beware, it could be a scam.
There is no Gloucester city in London. Gloucester is about 100 miles west of London.
Greater London
In the borough of Merton, Greater London, England.
By road Gloucester is about 112miles from London.
The address of the Brunel Hotel in London is 79-81 Gloucester Terrace, London, W2 3HB, United Kingdom. It is a three star hotel and one can stay there for $112 per night.
The smallest city in England is The City of London, a city within Greater London.
Leiths Cooking School is located in London, England. The mailing address of this school is 16-20 Wendell Road, London, Greater London, W12 9RT, United Kingdom.
The New Cross England is located in Southern London. The exact address is 322A New Cross Road, London, Greater London SE14 AS, United Kingdom. IT is only a minute or so walk to the New Cross Bridge.
England >> Greater London>>South
It isn't in a county. Greater London is its own administrative area.
The Tower of London is in Greater London and not in any particular county unless you mean 'country', in which case it is in England, which is part of the United Kingdom.
The term "Greater London" refers to an administrative area and ceremonial county in the area of London, England. It consists of the City of London and 32 surrounding London boroughs.