Fuel Filler Flap

[DO55MAC]

Basically my fuel filler flap doesn't lock. Even when the keys are at least 100 metres away the flap can be opened, either by pushing the flap in and releasing, or by getting my nail behind the flap and pulling. Does anybody have any idea how the solenoid sequence works, can it be reset or if the solenoid might be stuck? Is there an internal release mechanism that I'm not aware of?

I would have thought that when locking the car, the plunger would pop out and lock the cap, but alas, no, not mine! I'm a bit miffed because the plunger on my old X Type also failed, so that's 2 from 2!!!

I'd appreciate any help, thanks.

Mac