 The previous parish covered by the church was much larger than the ancient parish of Crawley.It covered most of the town west and north of the railway line between Gatwick Airport and Crawley railway stations, and up to the boundary of the airport.The boundary was defined by the A23 London Road from its junction with the Horsham Road in Southgate to the edge of the Manor Royal industrial estate at County Oak; the southern perimeter road of Gatwick Airport—incorporating all the land and buildings in the former village of Lowfield Heath; some farmland and residential development east of the railway line at Tinsley Green; the railway line from Tinsley Green to Southgate Avenue, near Crawley railway station; and the northern part of the Southgate neighbourhood.