[3] Grey became speaker of the House of Lords on 6 September 1647 and became a member of the committee of the navy and customs on 17 December 1647.
He was one of the lords commissioners who took the four bills to the king at the Isle of Wight, and had to bring them back unsigned.
On 17 March 1648, he was renominated chief commissioner of the great seal together with another lord and two commoners, but took no part in the trial or death of the king.
He remained in office until the commons voted the abolition of the House of Lords on 6 February 1649, and two days after placed the seal in other hands.
[1][2] Grey died aged 56 and a monument to his memory was erected by his widow in Flitton Church, Bedfordshire.