Maddox returned to London early in 1723 and, along with John Horsley, promptly conformed to the Church of England, though he remained on friendly terms with Dissenters, notably Philip Doddridge of Northampton; and he conspicuously supported foreign Moravian Christians in the North American colonies. In 1740, foreign Protestants after a residence of seven years could become naturalized on swearing an oath of allegiance. Quakers were exempted this oath. In 1747, with Maddox’s support, the exemption was extended to Moravians. In his speech in the House of Lords, Maddox insisted that It would be beneficial "if the British nation expresses itself in favour of the ; for whatever benefit England confers upon this ancient confessor Church must be an encouragement to all evangelical Christians throughout the world, to expect nothing but good from this country."