The Bishop of Coutances, Robert de Harcourt, officiated, guests included the Abbot of Mont St Michel and the governors of Caen, Cherbourg and Southampton.

[5]: 163 The break from the Catholic faith by Henry VIII of England resulted in the control of the church moving from the Diocese of Coutances to Winchester, this was followed by a return to Catholicism with Mary I of England in 1553 and the occurrence of a notorious event, the Guernsey Martyrs where the three women were tried by the Ecclesiastical Court in the Town Church in 1556.

[8] The church has been Anglican since 1662 when the book of Common Prayer was translated into French on the orders of King Charles II of England for use in the Channel Islands.

It is now a tradition to hold worship services in the Town Church at Easter and Christmas in both Latvian and English.

[2] The nave, tower and chancel are out of alignment, possible due to the cramped site on which the church is built.

[10] The quay to the east was built in the 18th century, necessitating the demolition of some old houses and opening up the view of the church from the sea.

A major renovation in 1822-6 saw the opening up of previously blocked windows and the Lady Chapel with the removal of the upper floor Ecclesiastical Court room, the relocation of the organ and the installation of a suspended plaster and lath ceiling.

[5]: 157 There were medieval houses and a mill close to the west of the church that were demolished between 1830 and 1870[5]: 157  to extend the market, create a square and let Fountain Street reach the quay.

Queen Victoria and Prince Albert landing from the Royal Yacht on the quay in front of the church in August 1846.

In 1882 further renovation works were undertaken providing the current pews, Caen stone pulpit and Italian marble font as well as moving the organ to its present location.

[11] Despite this the organ was reconstructed by Maley, Young and Oldknow and reopened in 1877[12] and comprised 3 manuals and pedals with 21 speaking stops and a spare slide on the Swell.

263 Squadron RAF attack on German submarine U-275, in the harbour on 14 June 1944 shattered most of stained glass windows in the church.

The colours of the Royal Guernsey Light Infantry which was formed to serve during the first world war, displaying their battle honours, are also hung in the church.

The island has a strong connection with the sea and there are a number of memorials to naval officers, such as Admiral de Sausmarez.

[2] A plaque to Major General Sir Isaac Brock, "The Hero of Upper Canada", is fitted to the outside of the church.

[8] Commemoration services are regularly held at the Church, especially on 9 May, Guernsey's liberation day and on the Sunday closest to 11 November.