Plating company recommendations

[Mr_B]

Anyone have experience of a zinc plating company that does great work and doesn't misplace any parts ? I need some brake calipers plated and yellow passivated along with lots of small components in bright zinc and a few bits nickel plated.
Some place in the south east preferable. So much of the work is small irreplaceable bits that I would prefer to drop off and pick up.
Thanks

[Mr_B]

Thanks all. Butterworths seems worth a shot as they are closest, and I'm paranoid about tens of tiny irreplaceable for multiple components bits getting lost.