That sounds pretty bad tbh - sounds as though they realised they wouldnt make any profit in doing the conversion (just the labour side) so have decided to try to make money on parts instead
My only experience of Power Engineering was when i went there last year for an mot & their head mot tester spend 10 mins trying to start my Focus RS with the key & told me my starter motor had gone & the car would fail its mot - one of the lads in the warehouse then told him it was a Focus RS and you started the car with the green button marked ''ENGINE START'' - he then proceeded to grind my front splitter out on the ramp into the workshop once the mot was finished lets just say i wasnt impressed said as much & wouldnt go back - Rob @ SCC all the way for me now