Belvedere Development.
The turbine powered version bore no relation to the ship borne torpedo firing botch-up that the British Navy wanted. It was similar in appearance, though larger, and more importantly, earlier than the Chinook. I cannot find any drawings of it at the moment but the ones I have seen were very impressive.
However, shoveling money into the back pockets of benefit scroungers, illegal immigrants etc, had a far higher priority for public money so the project was scrapped.