Here's a link to pics from the last Kempton in December.
https://photos.app.goo.gl/kiSwaB1jRfVkaMEn7
Among the huge array of airguns on offer, I can see an original Parabellum with open sights, a Woodstock with open sights, an AR7 with the correct Field front sight but missing the rear, a later Woodstock based on the Hi-Power action and a later AA Hi-Power, which I think came with open sights in a separate bag.
As for an AR7 with singlepoint sight in the correct mounts, I have a story; I mentioned to one of the dealers a few fairs ago that I was after one and he offered me the next one that came up. What a result! It also came with 5 tubs of Jackal pellets.
John
Currently looking for Baikal Makarov pistols with the following prefixes to the serial number: 98, T01, T09, T21, T22
Prefer boxed or cased but will consider loose examples too.