was abandoned. The ruin, dated 1635 but believed to have originated in the 10th or 11th century, still stands some west of the centre of Houston on the Barochan Cross Road. This church is now held by the Kilallan Kirk Preservation Trust following its donation by Elderslie Estates in 2005 and is a scheduled historic monument. An annual evening service is held amongst the ruins in July by the congregation of the united parish. The church's manse, which is immediately adjacent to it, also finds continued use as a private residence and is thought to be the oldest existing dwellinghouse in Renfrewshire. St Fillan's Holy Well and St Fillan's Seat are located near to the old kirk. St Peter's Well stands in a field below Greenhill Farm on Chapel Road close to the site of a pre-Reformation chapel and is a rare example of a covered or house holy well, the waters of which were once thought to ensure the safe return of travellers such as pilgrims. The Houston and Kilellan church hall on Main Street was built immediately following the Disruption of 1843 as a separate congregation forming part of the Free Church of Scotland, and later the United Free Church of Scotland being known during this time as the West Kirk. Following the reunification of the United Free Church and the established Church of Scotland in 1929, the West Kirk existed as a second Church of Scotland congregation in the village until a fire destroyed much of the building in March 1941. The lack of a building caused the two congregations to again worship in the same parish church. The West Kirk building was fully restored by 1953, taking its place as the church hall it remains to this day. Houston and Kilellan Kirk is currently the second richest church in Scotland, after Paisley Cathedral. St. Fillan's Roman Catholic Church, also on Main Street, was established in 1841 on a property called "Four Windings" now remembered in the name of an adjacent street. Economy Chiefly serving a commuter village, Houston's chief local economic activity is agriculture, with some tertiary sector businesses such as local shops and public houses serving residents and visitors. There are a number of these shops and pubs in the old village, and a number of shops located on the boundary with Crosslee. Public houses and brewing The parish supports a number of public houses,