fuel flap

My A2 is set up to give a reassuring bleep when I lock it, provided all doors, windows, inspection flap are closed. I thought this list included the fuel flap but today I noticed that the flap was open but the car still bleeped on locking. Is this correct? If not, is there a flap micro switch...

I recently bought an A2, at the time everything worked ok but since then there are a few things which have stopped working that i would like to sort out cheaply. 1. The fuel flap switch inside the car stopped working so every time i fill up i have to go into the boot and open it...