It is a GP, and it is a Bugle. The puzzle image is from the book "The Dune Buggy Phenomenon":
With interest in turn-key buggies for the rich and famous rising throughout the late 1960s, Bugle Automotive was set up in London by Roland Sharman to meet demand. Using both GP long and short-wheelbase buggy kits, the well-finished cars were dubbed 'Bugle Buggies'.