In message snipped-for-privacy@candehope.me.uk>, charles snipped-for-privacy@candehope.me.uk> writes
My aforesaid Fiesta doesn't do this - at least not that I'm aware of, as, as I would hear the locking sound.
Another 'feature' is that the fuel filler has no locking - in fact, there's not even a proper cap. You just pull open the flap in the body, and the only thing the tube to the tank has to seal it is a sprung flap (and this you push open with the tip of nozzle of the pump filler 'gun'). Anyone could put anything in your tank, and if there's nothing further down the tube to stop them, syphon fuel out.