[4] In 1735 he became Custos Rotulorum of Montgomeryshire and Lord-Lieutenant of Shropshire, and was Treasurer to the Prince of Wales (father of George III) from 1737 to 1738.

[2] In 1743 he was elevated to the peerage as Baron Herbert of Chirbury, in the County of Shropshire,[5] a revival of the title (spelt "Cherbury") which had been held in his family from 1629 until becoming extinct on the death of a son of his great-grandfather in 1691.

[10] During the time of the Jacobite rising of 1745, when Prince Charles Edward Stuart's Scots army was about to invade England, Powis was commissioned as Colonel on 1 October that year to raise a regiment of fusiliers in Shropshire to counter the invasion.

[2] They were ordered to march into Staffordshire but, being insufficiently disciplined and manned, they fell back without joining battle against the Jacobite troops who were feared to be heading for Wales[11] but diverted towards Derby instead.

[14] Lord Powis died at Bath, Somerset, in September 1772 aged 69, and was buried in St Mary's Church, Welshpool.