a) In the United Kingdom for
i) Income Tax from 1949-50,
ii) Corporation tax from 1 April 1964.
b) In Grenada from the year of assessment beginning 1 January 1949.
A further arrangement (SI 1968/1867), amending certain provisions of the 1949 arrangement, entered into force on 14 December 1968.
The text of the Tax Treaty can be found via https://www.gov.uk/government/publications/grenada-tax-treaties