Woodcock, Thomas Henry King, Robert Robertson and Sydney Herbert Marks from Leytonstone and was located on Katherine Road in Forest Gate, London.

The name Trebor, the spelling of "Robert" backwards, was registered as a trademark four days after the end of World War I.

In the 1967 Birthday Honours, the Chairman John Marks (son of the founder) was appointed a CBE for the company's exports; he was president from 1956 to 1959 of the Cocoa, Chocolate and Confectionery Alliance.

In the middle of the 1980s, the company was the British market leader in branded mints and boiled sweets.

It initially had a factory at Forest Gate called the Trebor Works from 1935 in what is now the London Borough of Newham.

The Trebor Bassett national distribution centre was in Holmewood, North East Derbyshire.