On 17 April 1774, Lindsey held the first Unitarian service in Britain, at the newly formed Essex Street Chapel in London; he had even designed his own liturgy, of which many were critical.
Pada 17 April 1774, Lindsey mengadakan layanan Unitarian pertamanya di Britania Raya, di Kapel Essex Street yang baru didirikan di London; ia bahkan merancang liturginya sendiri, yang mana menuai banyak kritik.