The binding posts on the left are the "Standard" Wilmslow Audio items that I fitted. When I cut the thread to reduce  it's length I discovered they are cast white metal, I had presumed they would be brass. The alloy is not the best of conductors so I fitted the ones on the right which where a Flebay purchase. They are solid brass (I checked) with a fairly thick Gold plating. The annoying thing is they where only 2/3 of the price of the first set with free postage and they arrived the day after I ordered them.