 In 1921, joint services with Maidstone & District Motor Services (M&D) were started between Brighton and Hawkhurst (later service 18) and Eastbourne and Hastings via Hailsham (15).Similar services to Southampton and Winchester (joint with Hants & Dorset) began in 1922, although the Winchester service was truncated at Fareham in 1926.Horsham marked the boundary with Aldershot & District, Southdown later abandoning its operations in Haslemere in favour of the Aldershot company.