Wow Simon, that's almost as if you flew to Sheffield wearing your cape and tights, and after pointing a finger that emits crackling energy, repaired the car personally
Of course others have had positive experiences with so called non specialist outfits, something you seem to ignore
Anyway, nice to hear the OP found a resolution to his problem, by using the recommended outfit, and as ever, sometimes independent specialists are more experienced in repair than others, law of averages and all that
Brian