houses called Tredomen; these houses were built to house the workers of the since-demolished Tredomen Works. They are socially graded houses – ranging from two-up two-down, to a five-bedroom manor in Park Lane with adjoining servants' quarters. In February 2018, the Beech Tree Fish Bar was severely damaged in a car crash, and the incident made national news. No-one was killed, but three people were taken to hospital. Religion The Anglican parish church for Ystrad Mynach and Llanbradach is Holy Trinity. It is a Grade II listed building, built in 1855–1857, by architect John Norton, for Revd George Thomas whose family were locally important landowners from Llanbradach. Bryn Seion Welsh Church is a nondenominational Christian church dedicated to continuing worship, fellowship and singing in the Welsh tradition. Situated on Lisburn Road, it was built as a Baptist chapel during the mid-nineteenth century, in the Round-Headed style of the long-wall entry type. It bears a mosaic, approximately square, with the name of the chapel, the chapel logo, the year 1906 and geometric shapes, including circles. The Methodist Church, on Lewis Street, was extended in 2013 to provide additional space for both worship and community groups. It also has an enclosed grassed area. The Siloh Calvinistic Methodist chapel was opened on 10 May 1910, when the town itself was growing quickly following the sinking of Penallta colliery in 1905–1910. Bethany United Reformed Church is located on Lisburn Road. Governance There are two tiers of local government covering Ystrad Mynach, at community and county borough level: Gelligaer Community Council and Caerphilly County Borough Council. Caerphilly County Borough Council has its main offices at Penallta House in the Tredomen area of Ystrad Mynach. Ystrad Mynach historically straddled the ancient parishes of Gelligaer and Llanfabon, both of which were in the county of Glamorgan. Much of the boundary between the two parishes was the stream called Nant Caiach (roughly following Nelson Road, the A472), with Gelligaer to the north and Llanfabon to the south. Holy Trinity Church was built in 1855–1856 as a chapel of ease within the parish of Llanfabon. In 1890 Holy Trinity was made the parish church for a new ecclesiastical parish of Ystrad Mynach, covering parts of the civil parishes of Llanfabon and Gelligaer. For civil purposes, Ystrad Mynach continued to straddle Gelligaer and Llanfabon. Llanfabon was administered as part of Caerphilly from 1893, whilst Gelligaer became an urban district in