From 1649 to 1660 Puritans in England were allied to the state power held by the military regime, headed by Oliver Cromwell until his death in 1658. They broke into numerous sects, of which the Presbyterian group comprised most of the clergy, but was deficient in political power since Cromwell's sympathies were with the Independents. During this period the term "Puritan" becomes largely moot, therefore, in British terms, though the situation in New England was very different. After the English Restoration the Savoy Conference and Uniformity Act 1662 drove most of the Puritan ministers from the Church of England, and the outlines of the Puritan movement changed over a few decades into the collections of Presbyterian and Congregational churches, operating as they could as Dissenters under changing regimes.
The English Interregnum was a period of religious diversity in England. With the creation of the Commonwealth of England in 1649, government passed to the English Council of State, a group dominated by Oliver Cromwell, an advocate of religious liberty. In 1650, at Cromwell's behest, the Rump Parliament abolished the Act of Uniformity 1558, meaning that while England now had an officially established church with Presbyterian polity, there was no legal requirement that anyone attend services in the established church.
In 1646, the Long Parliament had abolished episcopacy in the Church of England and replaced it with a presbyterian system, and had voted to replace the Book of Common Prayer with the Directory of Public Worship. The actual implementation of these reforms in the church proceeded slowly for a number of reasons: