Thomas Lumley bought a troop in one of the new regiments raised during the 1715 rebellion but left the army in 1718 at the wish of Lord Castleton, who had made him his heir. Returned in 1722 for Arundel on his family’s interest, he was appointed envoy to Portugal, where he remained till 1723, when he succeeded on Lord Castleton’s death to estates in Lincolnshire and Yorkshire, worth £8,000 a year, assuming the name of Saunderson. After coming to an arrangement with his creditors, a list of whom in 1724 shows liabilities of nearly £24,000, including over £10,000 to his elder brother, Lord Scarbrough,
Elected for Lincolnshire without opposition in 1727, Saunderson applied for a peerage as Lord Castleton’s heir. Owing to George II’s aversion to granting peerages the request was unsuccessful ‘notwithstanding the most pressing solicitations of my Lord Scarbrough, who, upon his application to her Majesty to use her good offices in favour of his brother, was answered, that she durst say no more to the King upon this head’.
Re-elected unopposed for Lincolnshire without a contest in 1734, Saunderson continued to speak and vote with the Opposition. In 1737 he was among the Members of the House of Commons who were sounded by the Prince of Wales about an application to Parliament for an increase in his allowance.
In 1740 Saunderson succeeded to the earldom of Scarbrough on the suicide of his elder brother, who left a will remitting ‘to my brother Sir Thomas Saunderson any sum or sums of money he shall owe me at the time of my death and any annuity for his own or my own life which he may be engaged to pay me’; giving him £20,000 for the payment of his debts; and, subject to various other legacies, bequeathing all his real and personal estate to James Lumley. The new Earl did not conceal his disappointment at not succeeding to the family estates, taking the line that it was ‘an ill return for the confidence he put in his brother when, being in the entail, so that without his consent the late earl could not dispose of it, he generously consented the cutting it off’.
After Walpole’s fall Scarbrough, along with the rest of the Prince’s servants, supported the new Government, attending the Prince when he went to court on 17 Feb. 1742 and moving an address approving the Hanoverians on 1 Feb. 1743. He lost his post on Frederick’s death, dying a year later, 15 Mar. 1752.
