Yes. They had the colony of British Guiana (modern day Guyana) from 1814-1966 although few Brits actually migrated to the country. The majority of the population is East Indian and Black (African)

Yes British Guina (today Guyana). It was a British controlled territory until the late 19th century under the "United Kingdom of Great Britain and Ireland" (today the United Kingdom of Britain and Northern Ireland).

A few islands I believe also were also under the control of the empire.

Guyana, Falkland Islands, South Georgia and the South Sandwich Islands

Yes, try Google