please do not be offended by this "but what is the fault with the TPS and how have you diagnosed it faulty”.
The reason why is that I do a High volume of Rover cars from all ages and on the MEMS systems I would say that the most reliable sensor of this Sytsem I have found is the TPS. I cannot remember ever changing or find one that was faulty.
Not like the old Lucas Hot wire systems of the Montego and Rover 216 days......That failed and had heat soak problems