HJ Hussey shotguns are great quality. I have owned one in the past. There is information on the man and the guns in "Atkin,Grant &Lang" by Don Masters.
HJ Hussey started out working for Holland I believe. He was well know as a pigeon shooter and built guns for the sport. He went in business with Joseph Lang, somewhere along the way there was a dispute. I believe the thought was he was selling guns out the back door. They parted ways and he started HJ Hussy. He made some of the finest London guns till his death on New Years day in 1919.