not being part of my normal interest area, I've haven't followed this thread, and so missed seeing the request for National Archive data.
Since 1886 falls a little beyond the range where I would normally have readily available pix (1842 - 1884) - I will need to make a visit especially for Rd. Nos. 53732-3-4.
I see Christine has kindly explained, briefly in words, some outline description of the images of these three Registered designs - although this won't mean a great deal I suspect unless you have Mervyn Gulliver's book, which shows a reproduction of the original Stuart drawings.
I don't know if Jim has Gulliver's book - if you do Jim then you won't need pix of the Kew images, since the author does in fact repeat exactly (albeit in his own hand drawn pictures) the Archive images. However, if you don't have the author's book, and would like to see digital photos of the National Archive Stuart drawings of these three Registrations, do shout and I can provide these a little later this week.
Of course, I may be way too late to provide anything of interest, but thought I'd ask just in case.