In November 1756 Heathcote was offered by Newcastle a seat at Aldborough, without trouble or expense, but declined because of ‘very particular objections’ to being in the House: ‘the attendance ... would be very disagreeable to me’, he wrote to Hardwicke, 22 Nov., ‘and what I don’t think I should ever perform as I ought to do’.
In June 1760 Lord Exeter wrote to solicit Heathcote’s support in Rutland for T. C. Cecil and Thomas Noel—Lord Winchilsea was running a candidate against them. Heathcote consulted Hardwicke, and Hardwicke Newcastle: he would not have Heathcote ‘take such a part now, as, by an absolute submission, may exclude him for ever from taking advantage of the great property which he has in the county’. Newcastle offered to find a borough for Heathcote who should now, against a future election, try to form a connexion with one ‘of the noble families in the county which his father had neglected’.
On 3 Feb. 1761 Newcastle wrote to Hardwicke offering Heathcote a seat at Shaftesbury on Lord Shaftesbury’s interest. ‘But the expense will be very great ... viz. £2,000.’
And then on 4 Apr. Lady Grey wrote to her husband, Lord Royston:
The strangest event that has happened since you left us, is the desperate resolution Sir Gilbert has taken to go down and vote in Rutlandshire, for which he sets out with an aching heart, sleepless nights, and trembling nerves (God willing) tomorrow morning, and leaves my lady and the steeds to the protection of the fates for four or five whole days. It would tempt one to do something very riotous, carry off the former and turn the latter out to grass, if a cold on her part and a great deal of sobriety on ours, did not secure him.
In Parliament Heathcote voted against the peace preliminaries, 9 and 10 Dec. 1762; opposed Grenville’s Administration; and supported Rockingham. He did not vote on the land tax, 27 Feb. 1767, but was classed by Newcastle as a friend, 2 Mar. 1767, and voted with Opposition on the nullum tempus bill, 17 Feb. 1768. There is no record of his having spoken in the House. He did not stand again, either for a borough or for Rutland.
He died 2 Nov. 1785.
