Treadi,
Middle - Blackburn Beverley when preserved at Museum of Army Transport, Beverley. Now moved to Fort Paull and the only survivor.
That photo wasn't taken at the Beverley museum. It looks more like XH124 at Hendon that was subsequently scrapped. You're quite right that XB259 was at Beverley and as the sole survivor is now at Fort Paull.
CAEBr