Shortly afterwards, having previously resigned his canonry at Peterborough, he was appointed by the crown to a canonry at Westminster, and accepted the position of examining chaplain to Archbishop Benson.
He was a select preacher at Oxford in 1895-1897, and at Cambridge in 1900; he received a canonry in Bristol cathedral in 1893, but retained his wardenship of Toynbee Hall, while relinquishing the living of St Jude's.
At the close of 1856 Stanley was appointed regius professor of ecclesiastical history at Oxford, a post which, with the attached canonry at Christ Church, he held till 1863.
He preached before the Commons in 1642, but his sermon gave offence, and when in 1647 he took a prominent part in resisting the parliamentary visitation of Oxford University he was deprived of his canonry and living.
In 1868 Westcott was appointed examining chaplain by Bishop Connor Magee (of Peterborough); and in the following year he accepted a canonry at Peterborough, which necessitated his leaving Harrow.
In June 1906 he was preferred to a canonry at Westminster, and when in December he resigned the wardenship of Toynbee Hall the position of president was created so that he might retain his connexion with the institution.
He returned to Erfurt in 1514 or 1515, was ordained priest, and in 1518 was promoted doctor in both faculties and appointed to a wellendowed canonry in the church of St Severus, to which a profes sorship of law was attached.
He held his canonry at Westminster in conjunction with the regius professorship. The strain of the joint work was very heavy, and the intensity of the interest and study which he brought to bear upon his share in the labours of the Ecclesiastical Courts Commission, of which he had been appointed a member, added to his burden.
In 1724 he became rector of Houghton-leSpring, Durham, resigning in 1727 on his appointment to the rectory of Ryton, Durham, and to a canonry of Durham.
His activity was so notorious that he was exiled from court, but was consoled by a canonry at Toledo.