Newnham was a London merchant, a Dissenter, and closely connected with the Pelhams in Sussex affairs. In 1754 he was returned unopposed at Bramber, then at the disposal of Administration. This arrangement was apparently for one Parliament only, and during 1760 Newnham was manœuvring for a seat at Ashburton; while in July 1760 Newcastle, in his‘List of persons to be brought into Parliament’, put him down for ‘Barnstaple—if possible’.
He died 17 Sept. 1778.
