I missed the ? off the end, looking again it is an Alcon type B but most likely the 888 version, an Astra VXR?
Regardless I'm betting you got vibration? Those Ferrodo pads really suck ass, took me 1 session at Oulton to melt them to the disc and I had to get the discs re-polished and ditch the pads for something decent. Since then, A-OK.