Albert Blackshaw used to make and fit these but the last I heard of him, a year ago, he was living on his Centaur in La Rochelle. I think Trafalgar Yacht services do something similar.
Some time back I found a firm that produced gas lockers to retro fit in to the Centaur range. There is one and two gas bottle versions. Of course, I can not find the blurb they sent. Can anyone remind me what the firm is called and how to contact them. Thanks John Dillon