In the early 1970s the main A4 road was routed onto Wellington Street, north of and parallel to the High Street. This re-routing allowed the building of a major shopping complex, Queensmere, between the High Street and Wellington Street. Slough was incorporated into Berkshire from Buckinghamshire in the 1974 local government reorganisation. The old Municipal Borough was abolished and replaced by a Non-metropolitan district authority, which was made a Borough by the town's second Royal Charter. Britwell and Wexham Court became part of Slough at this time, with their own parish councils.