6023 was then bought by the Great Western Society (GWS) and moved to the Didcot Railway Centre in March 1990 for its restoration to continue. The restoration included the casting of new rear driving wheels in 1994, followed by re-wheeling the chassis in 1995. The casting is notable since it is thought to be the first wheels to be created for a standard gauge locomotive in preservation. The damaged wheels were also acquired by the GWS at Didcot and can today be seen on display there. Unlike the other preserved "King" class locomotives, the GWS decided to restore 6023 to its as-built single-chimney configuration. All "Kings" had been converted to double chimneys under British Railways ownership, which improved performance and efficiency but changed the original appearance.