[2] Having paid his respects to Prince Charles Edward, when he held his court at Holyrood in 1745, he was afterwards exposed to much annoyance and even danger on that account, and was glad to avail himself of his medical degree, and wear for some years the usual professional costume of the Edinburgh physicians.
Drummond was the first among the bishops to urge that the time had now come for the Episcopalians to give a public proof of their submission to the House of Hanover by praying in the express words of the English liturgy for the king and royal family.
Drummond continued Bishop of Edinburgh until 1805, when, on the union of the two classes of Episcopalians, he resigned in favour of Very Rev Dr Daniel Sandford.
Drummond was a good theologian and well-meaning, but, says Russel, 'his intemperate manner defeated in most cases the benevolence of his intentions, and only irritated those whom he had wished to convince.
'A Dialogue between Philalethes and Benevolus: wherein M. G. H.'s defence of Transubstantiation, in the Appendix to his Scripture Doctrine of Miracles displayed, is fully examined and solidly confuted.
His letters to Bishops Douglas and Skinner, mostly on the recognition of the Scotch episcopal church of the Hanoverian line of succession, are among the Egerton and Additional MSS, now in the British Library.