Should do mate, but i found halfords to be very expensive, you may be better going to a parts place and asking them.
My wheels wouldnt rotate either, i fitted 5mm because i didnt wanna push the front wheels out to far, and will try with the 3mm ones i bought.
IIRC 10mm spacers in halfrauds are about £15, but them remember that you may need longer bolts to secure the wheel fully.