In 1943, he relocated to London, Ontario, assisting in the war efforts at Central Aircraft, a subsidiary of de Havilland.
Garratt as ‘CF-FHB’ in honor of its designer, is on display in the Canadian National Aviation Museum in Ottawa.
A noted competitor in the 14-footer class (precursor to the International 14) at the Royal Canadian Yacht Club in Toronto and internationally, Buller initially expressed his interest in sailboat design through innovative customization of hulls designed by others (notably Charlie Bourke); his execution of a gybing centreboard was regarded as one of the first truly effective examples.
Buller was also credited with bringing the tell-tale, a strip of string or cloth attached to a wing to test its aerodynamic qualities, over to the sailing world.
For his achievements on the racecourse and as a designer, Buller was in 2013 posthumously inducted into the Canadian International Fourteen Foot Dinghy Hall of Fame.