[1] The dedication is because Watchet is believed to be the place where Saint Decuman was killed.

The church stands on a prominent site overlooking the town.

It was restored and reseated by James Piers St Aubyn in 1886–1891, with further internal alterations being made in 1896 when the Caen stone reredos was erected.

Included is a memorial to Sir John Wyndham (1558 – 1645), who played an important role in the establishment of defence organisation in the West Country against the threat of the Spanish Armada.

A mural monument exists with kneeling effigies of two of Sir John's sons, Henry and George, as well as other monuments to the later family of Wyndham.