I think you're meant to go through the website, and download the images from there. The photography looks to be high quality, and fairly high resolution-- though not spectacularly so.
The Death of Socrates. Click on "download", and you'll receive a a 3811 × 2528 pixels JPEG.
Armor Garniture of George Clifford (1558–1605), Third Earl of Cumberland. You can download a 1457 × 1861 JPEG.
As far as metadata is concerned-- the EXIF contains a link back to the catalog page. Camera specific metadata has been stripped.