Having the Conway Library available online as of today is a pretty amazing resource – rich in imagery precisely because it is a bit haphazard. I checked its selection on Castle Howard – lots of images, mostly post-war, very high quality, including those of Anthony Kersting, one of the best and most knowledgeable architectural photographers, and including a photograph of the Temple of Venus which Kerry Downes must have added (he was pretty serious as a photographer). There are nearly 1,000 photographs taken by Sir Anthony Blunt, from which it would presumably be possible to deduce the full range of his architectural interests – French seventeenth century, Sicilian baroque. I particularly like the way you get pictures of the boxes as well.

It’s fantastic to have it so freely accessible.

https://photocollections.courtauld.ac.uk/menu-item1/conway-library