They are way overpriced but Axesrus has gold polepieces:
http://www.axesrus.com/axeScrews.htm
The Allparts ones are badly plated, you can scrape the gold off with a light touch of your nail and a screwdriver destroys them
I've never tried the axesrus ones, just thought I'd give you a heads up of a UK supplier for them. Their shipping is super fast too!