As James says,as ever ! Well worth checking the wiring to the sensor,making sure they really ARE all the way home and cleaning the disc.....it can cure a multitude of supposed faults.Do I remember rightly that they are behind the mud shield plate? If so,a whole lot of crap can get held there,so well worth cleaning that out anyway.
The instructions I had were to push them all the way til they contact the disc,then they settle themselves at the correct gap.
Worth checking too is the pedal brake light switch,I have known that throw up spurious fault codes about the ecu. I dont know what they are to buy now,I payed £12 for the last one some years ago,others I have had out of scrap cars for nothing.May be worth checking if Rovers of the same age use the same switch,I know a lot of the dash switches are common to LR/RR ones.I had one where the pedal switch had been partially knocked out of its mount - putting back in place solved the problem.