Two of Luke’s ancestors made their fortunes under the Tudors, one as a justice of King’s Bench and the other as an Exchequer baron, while in 1592 the future MP was admitted to the Middle Temple free of charge in recognition of the £20 that the Exchequer baron, a former bencher, had contributed towards the building of the Hall.
The relative with whom Luke became most closely entangled was his brother-in-law Sir Miles Fleetwood*, for whom he purchased the manor of Aldwinkle, Northamptonshire, and on whose behalf he probably interceded with Oliver, Lord St. John† for a parliamentary seat at Huntingdon in 1614.
Luke’s inheritance of the family estate in 1613 undoubtedly encouraged him to stand for Bedfordshire at the general election of the following year, but the crucial factor in his success was probably the 6th/7th earl of Kent’s promotion of his nephew and heir presumptive Sir Henry Grey* for the first seat. Under these circumstances Luke’s second cousin (Sir) Oliver St. John I*, senior knight in the two previous parliaments but heir to a mere barony, would have had to settle for the junior seat, and he apparently preferred to stand aside rather than cede precedence at the election. During the 1620s Luke shared the representation of the shire with his St. John cousins, without any known competition from other county families.
Luke played only a minor role within the Commons before 1629. He presumably sponsored a bill to confirm his purchase of lands in Huntingdonshire from Sir William Dyer, which received a single reading on 8 Mar. 1621.
Luke’s political views are better illustrated by his activities outside the House. In February 1622 he was one of a large number of MPs summoned before the Privy Council to explain his reluctance to contribute to the Palatine Benevolence.
Luke was probably as concerned about religious issues as he was about the abuses of prerogative finance. Although a conformist before the Civil War, in 1629 he hoped to see ‘something ... for discountenancing both the Popish and Arminian party’.
While Luke’s closest political allies were his St. John relatives, he also had connections with more radical critics of government policy including (Sir) John Eliot*. Eliot’s earliest biographer assumed that the pair met in 1614,
Luke briefly entertained hopes of a fresh Parliament in the autumn of 1631, a notion quickly dispelled by Eliot.
