Dave, absolutely agree but I think the reason for not listing the DEI GRATIA is, unfortunately, they can't be bothered! I don't think any copper experts have much of an imput into the catalogue and it's easier for Spink to just copy and paste from the last catalogue. Not that I can blame them, they're understaffed and are short of experts these days, but I don't think it would take much to iron out the anomalies and put in, say, W&M - George II proofs, and the 1771 farthing proof (whereas the 1770 1/2d now listed both as copper and silver proofs).
Rob, with respect, I don't think a plumes sixpence, identical to the normal currency sixpence except for plumes presumably, registers as a major "type" coin, whereas the 3rd issue WM III halfpenny - totally unique obverse and reverse and a very common issue, is surely far more important for an image.
Talking of Wm III, I would be impressed if any one knows of any sales data for the 2 listed "flaming hair" proof shillings 1698/1699. Though priced, personally I don't think they exist at present, as I have never come across any evidence of their existence. The BM doesn't have any, needless to say. Both dates are priced in Spink but the 5th bust 1699 proof, of which several examples have come up in auctions and sales lists over the years, is unpriced and listed as "extremely rare".