I have a Sturmey Archer square taper single speed chain set .Yours for £10 + postage at cost .
Pm if you are interested ,
I also have a un used single speed conversion kit .£10 + post .
I have a set of shimano 600 single pivot calipers. Some rusting to the chromed bolts, one adjuster is not original, but they work fine and the pads have life left. 10 GBP posted for the pair.