I asked Dave about plating an Aristocrat Jnr and this is the reply I got in June, prices may have changed a little but should be roughtly around this,
Thanks for the enquiry.
Would you need the Aristocrat Nickel or Gold Plating?
With regards Gold, I can spot plate if there is no corrosion (just usual wearing of the plating) and cost is £10 per razor plus postage.
For nickel, I totally strip the old nickel and replate in bright nickel (as the original) or a gold or silver plated razor can be nickel plated. Again price is £10 per razor plus postage.
Hope this helps