[7][8] The detached part of Crawley parish consisted of heavily forested land and one farm near Pease Pottage.

[9] The nave roof was also rebuilt at this time, and the earliest surviving memorial carvings and stones in the church are also 15th-century.

[5][10] By the 16th century, Crawley's development into a thriving market village meant that its parish was much more important than that of Slaugham, and the connection between their two churches was legally severed.

[11] At least 150 people regularly attended the church,[12] but its income was modest and priests frequently moved on to richer parishes.

FECIT Lester (master of the Whitechapel foundry between 1738 - 1769) gave Sussex many bells, our closest surviving examples are at Horsham, St Mary the Virgin.

[6][10][16][17] Nikolaus Pevsner has criticised the resulting appearance of the church, calling it "dully Victorian" and noting that its best feature is the unrestored 15th-century nave roof.

It was decided to install a new peal of 8 bells in the tower by the late Croydon firm Gillett, Bland & Company.

The bells are inscribed as follows (A / denotes the end of line): 1 (Treble): CAST BY GILLETT, BLAND & Co, CROYDON, 1880.

[18] The church's location just east of the High Street[16] meant that it was very close to the boundary of Ifield parish.

[19] However, his substantial girth caused him problems: he had to sit in the gallery because there were no pews large enough to accommodate him in the nave.

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.

[22] St Peter's in West Green predates the New Town, having been built between 1892 and 1893 to a design by architect W. Hilton Nash.

Although the Diocese of Chichester would not pay for a separate church, it accepted St Peter's, which was built with private money, when it was offered.

William Burges designed and built this yellow sandstone 13th century-style French Gothic[26] church in 1867[27] to serve the village of Lowfield Heath, which was then in the parish of Charlwood in Surrey.

The Diocese of Chichester stopped using the church for services in 2004; in March 2008 it allowed a Seventh-day Adventist congregation to use the building as its place of worship.

St John's Crawley run an Alpha course every term, providing an opportunity to freely discuss some of the bigger questions of life, faith and purpose within a Christian context.

As well as Sunday services, there are groups that meet throughout the week, seeking to deepen faith and grow in community.