In 'V Bombers' published by Ian Allen in 1981, there are 2 pictures of 875. Both are in Grey/Green low level camoflage and mention that 875 was a B(K)1. The first mentions she was one of the aircraft used for Operation Grapple, the H-Bomb trials on Christmas Island. The second was taken at Wisley late 1964 where she was being used to assess the rear spar fatigue which caused the Valaint's early demise. the book also mentions that she was the last Valiant off the production line being delivered in 1957.
Forty five of the 111 Valiants built were constructed as B(K)1s with the ability to both receive fuel and also dispense from a single Hose Drum Unit carried in the bomb bay.