Doctrine of the Trinity Act 1813

The Doctrine of the Trinity Act 1813 (53 Geo. 3 c. 160. sometimes called the Trinitarian Act 1812) was an Act of the Parliament of the United Kingdom which amended its blasphemy laws and granted toleration for Unitarian worship. 
The Act was also variously known as the 'Unitarian Relief Act (Trinity Act)', 'The Unitarian Toleration Bill', and 'Mr William Smith's Bill' (after Whig politician William Smith). The Dissenters (Ireland) Act 1817 (57 Geo. 3 c. 70) extended the Doctrine of the Trinity Act 1813 to Ireland, and amended the Prohibition of Disturbance of Worship Act 1719 (passed by the Parliament of Ireland) in the same way as the 1813 act had amended the 1689 act.
The Doctrine of the Trinity Act 1813 was repealed by the Statute Law Revision Act 1873.