From VCH: "Thomas Purchaceour, or Purchase, obtained a licence in 1340 to build a chapel at Colnbrook, which was consecrated in 1342. It is usually called the free chapel of St. Mary Colnbrook, and several institutions to it are recorded in the 15th century. In 1442 a grant was made in free alms of 12 ft. of land at the eastern end of the chapel in order to enlarge it. At the end of the 15th century the advowson was appurtenant to Parlaunt Manor, Langley Marish (q.v.), and follows the same descent until 1547, when the chapel lost its endowment, which was stated to be of the gross yearly value of £7 6s. 1d. The town then maintained the chapel, supplied the incense and wax, and owned the ornaments, and allotted some of the profits of the markets and fairs to its maintenance. The money thus obtained was not sufficient to keep it in proper repair, and since the wardens had no power to levy a church rate the chapel was constantly in a state of dilapidation. Private benefactors, including Sir John Kidderminster (Kedermister) of Langley Park, also contributed to its upkeep during the 17th century. It had been pulled down some years prior to 1773, and another chapel dedicated to St. Mary was built on a different site in Horton Parish by Thomas Fennel of Colnbrook and consecrated in 1794. The building was still in existence in 1862, but has since been demolished. The donative from 1683 was vested in the trustees of the Townshend Lectureship at Pembroke College, Oxford, in accordance with the will of George Townshend of Lincoln's Inn, who endowed it with half the profits of some tenements in Drury Lane."