I have a gb270 when driving home to night the noise of metal on metal or like i was dragging my exhaust along the floor. It is commin from the back left hand corner anyone got any ideas what it might be.

 

Had this before on previous cars and it was a stone stuck between the brake disk and the brake shield. Could be the same?

 

me too, had that and it was infact a stone trapped between disc and shield. remove asap or youll have a lovely grooved disc. you will need to remove the wheel and check behind, dont just look through the front mate

 

Cheers will have a look in the morning.