Well. Looks like I'll be raising an eBay dispute and trying for a refund as the refurb job on the calipers is distinctly average and very much DIY looking.
Powder coat too thick, causing seals to not sit flush, didn't bung the brake line input so fluid has leaked out and ruined the coating, the decals look like they have had 1 thin layer of cheap Halfords rattle can laquer sprayed over them.
I could either get a full refund or send them somewhere proper for a refurb, but the calipers already owe me £400. f*ck sake!!!
And I kerbed a wheel a couple of days ago. FML.