Those are lovely and extremely well cared for by the looks of it. I also had a set of Golden Suns (all my sons are actually golden) with a Hi-Fi snare. 20/16/14/12/Sn, see pic.
If you are in London then get on the Premier Fb page, you will likely have a good chance of getting a sale and decent price there. Fair chance of a pick up too. Incidentally, a 20/4/12 sold just recently in the UK for £895, desirable tubs.