In message , fred writes
In article , Jethro_uk
writes
On Tue, 02 Dec 2014 06:36:41 -0800, JimK wrote:

If I took a car belonging to someone else for an MOT test to decide how
bad it is and so whether I'd want to bother, would the MOT failure
overrule the few days left on the old MOT?

Jim K

No.

However, if you/your friend is subsequently stopped, and the vehicle is
found to have a defect that was noted on the failure slip, you could be
in more trouble, than if it wasn't.

Sort of, anything that amounts to, "using a vehicle in an unsafe
condition" will see you in bother so a nick in a viper blade or even a
lamp out will not but a bald tyre or faulty brakes will.
And don't forget all MOTs are electronically logged so I would imagine
if plod checked they may well get your failed MOT as the latest test and
obviously as it had failed the vehicle is intrinsically unsafe. The
owner of the car might not be too chuffed about that.
I would suggest maybe the OP ask the garage for a pre-MOT inspection and
report.
--
bert