Before the Northamptonshire by-election of 1754 Lord Northampton wrote to Cartwright, 4 May 1754:
No vote or speech of Cartwright’s has been recorded. On 23 June 1757 Charles Townshend reported to his mother a conversation in which Cartwright, disgusted by Pitt’s joining with Newcastle, had said he would ‘go no more to Parliament in this incurable age, but turn planter and husbandman, to divert his mind from the recollection of his own credulity’.
In December 1767 Cartwright declared his intention not to stand again ‘on account of his ill state of health’.
