The locomotive itself was adequate but not successful enough for further development, and drawings for a revolving coal bunker made by Beyer, Peacock in 1930 were not pursued. Indeed, the design did have some expensive flaws; soft water resulted in the boiler being retubed in 1926, firebox damage was diagnosed in 1927 and 1928, and the loco was out of service for nine months during 1930 during which time some modifications were carried out and a new firebox fitted. After this the loco itself settled down to working its regular beat up and down Worsborough Bank, despite continued steaming problems and a definite susceptibility to poor quality coal. It was renumbered 9999 in the LNER renumbering scheme of 1946, and became 69999 on the creation of British Railways in 1948.