Godwin's diary Vol VII f 46r: M P Andrews, Lyttleton's Moloch, a letcherous old miser. M.
Francis Andrews 1718-1774 (A History of the Irish Parliament) fits the bill, in some people's views. There were no MPs with surname Andrews in English Parliament in 1754 - 1820. George Lyttelton DNB 1709-1773 would seem to be the likely author, but I can find no instance of Moloch in his works. M could be James Marshall or Basil Montagu among others