Been down the Pinterest route. I have tried plastic tubs but they can't take much weight and eventually crack and split. Much the same with the large plastic cases a lot of these warp and the catches snap. What I was hoping to find are long life plastic the same size as the cartons of screws you get from screwfix. Then just put them in a some sort of cabinet and when needed just take out the sizes I need.
Drayton pre setting key for Drayton TRV 4 valves, usually £15 or more, misplaced my set, & didn't intend spending another £15. http://www.screwfix.com/p/drayton-pre-setting-key-0735132-2-pack/1351r