All N14 and N15 calipers and discs fit onto the UK built micra easily.
Just have to make sure the discs are centred in the caliper - as mentioned you do this by changing the position of the caliper with washers. Preferably high tensile or stainless steel washers. NOT mild steel/zincalume washers.
naah, 14's arte fine so long as your wheel balancing weights are on the far inner edge of the wheel...(ie towards the inside of the car)....cos mine are on the outer side...and are just 1mm away from the pulsar calipers..lol