His parents were Baptists; his elder brother, George Wiche (died 2 November 1794, aged 78), originally a mechanic, became steward of the assembly rooms in Taunton, where his portrait, by Thorn, was placed by the subscribers.
On their advice he became in December 1746 minister of a small General Baptist congregation at Maidstone, and held this charge till death.
After the Birmingham riots of 1791 he went to Henry Dundas (afterwards first Viscount Melville), then Home Secretary, with a deputation from Maidstone in Joseph Priestley's interest.
[1] He published, besides single sermons and tracts: To Priestley's Theological Repository,’ 1786, v. 83, he contributed ‘Observations favouring the Miraculous Conception,’ signed Nazaraeus (attributed by Thomas Belsham to Newcome Cappe).
Some time after Lardner's death Wiche obtained access to four of his manuscript sermons (preached 1747), and transcribed and published them as ‘Two Schemes of a Trinity … and the Divine Unity’.