Kinda makes you wonder why the CAA waste their time and everyone else's money making rules like that whan there was evidently no problem to address in the first place. If all those (300+) Bulldogs that were flown so much more intensively and so much more enthusiastically than any civvy type never had a problem then this configuration of fuel system is surely about as sound as one can be, isn't it?
I wonder why they thought it 'needed' regulating?