You can have your car MOT'd up to 30 days prior to the existing certificate's expiry date.
With a little bit of forward planning, there is no need to leave it until the very last minute, and potentially leave yourself without a car.
Get it booked in sooner, rather than later.
Perhaps I'm wrong on this, I was told it was registered on the system as failed though and would therefore show up on any roadside computer check as having failed MOT.
in theory all MOT test centres should be the same right?? But I hear that some centres will "make up"/exaggerate stuff for you to fix stuff that you don't need inorder for them to drum up extra business does this kind of thing still happen?