St John's in the Square
The church was built between 1758 and 1776 and was built as a chapel of ease of St Peter's Collegiate Church. This was owing to the rapid population growth at the time.
It has a wonderful acoustic and is used for concerts regularly.
For information about concerts and other special events at St. John's, do visit their Facebook page.
For more information about the history of this church, Wikipedia has a great page, which also has interesting facts about the church's 1684 Renatus Harris organ.