thanks for advice
jacked car up, could not turn wheel
removed wheel,
disc would not moved, freed off brake pads
disc would turn
took off brake caliper, clean up brake pad runners (guides on the frame of hub carrier)
put back together
applied brakes
tried to turn disc, would not turn
clean and played about with it,
discs are worn and i think brake pads are jamming on the worn lip of disc

will get new discs and pads 2morrow