Heritage Open Day: Grade I listed building. Most important Georgian church in Surrey. Built 1749-63 by James Horne in Palladian style, replacing medieval church. Enlarged in 1888 by Sir Arthur Blomfield. Fine Renaissance tomb of George Abbot Archbishop of Canterbury. Holy Trinity was built in the 1750s, after the medieval church fell down in 1740. It is a simple Palladian church, a popular style at the time, inspired by Roman architecture. It makes a distinctive landmark on Guildford High Street. The first church was probably built around 950 when the High Street was laid out to make Guildford into a town. The east end was added in 1888 to make the church bigger, for a different style of worship.