
The business of H. V. Burlingham Limited, of Blackpool made the 'Seagull' coach in the 1950's. It was taken over in August 1960, by Duple who called it Duple (Northern) from 1962.
In 1968 it became Duple Coachbuilders Limited, then in 1983 after being taken over by Hestair it became Hestair Duple. Hestair owned Dennis.
In 1989 it became Trinity Holdings in a management buy-out who closed the factory selling the jigs to Plaxton. Throughout the 80's competition became very severe and sales gradually reduced.
Huddersfield Passengar Transport Group have a full collection of photographs of the vehicles made by Burlingham.
http://www.jsh1949.co.uk/jsh1949/h_v_burlingham%20home%20page.htm