30777 Sir Lamiel was built for the Southern Railway in 1925. As it was a member of the 'King Arthur' Class, Sir Lamiel was named after one of the Knights of the Round Table. The engine originally hauled expresses to Bournemouth and Salisbury, among other destinations in the region.
Sir Lamiel was re-numbered from 777 to 30777 after nationalisation in 1948, and continued working in the same region until it was withdrawn from service in 1961.
The engine was quickly preserved, and it now runs on the Great Central Railway in Leicestershire.