Hello,
Currently on ebay there are a couple of collections of photos from 25 Squadron including examples of Airco DH.4 at:
https://www.ebay.co.uk/itm/25-Sqn-RA...EAAOSwl0xenET8
https://www.ebay.co.uk/itm/25-Sqn-RA...oAAOSwWPtenEfH
I've listed them here as most of the other photos in each linked item are of personnel.
Regards,
Clint