PAR were clients of mine for decades and are now owned by Medway Galvanisers so may have access to the right equipment if they can't do it at Rayleigh.
A few weeks ago I asked Griff Chains Ltd. (a firm that manufactures chain in the UK) where they get their galvanising done and I had the following reply:
"Depending on the weight involved would determine which galvanisers we use
Small lengths upto 20/25kg - Joseph Ash Tel: 0121 552 1682
Longer lengths - B E Wedge Tel: 01902 630311"