Bellingham came of a cadet branch of the Westmorland family which had migrated to Sussex in the fifteenth century and produced a Member for Gatton in 1545.
Bellingham presumably owed his election for Bletchingley in 1604 to Nottingham, who had recently settled the manor on his eldest son, William, Lord Howard of Effingham (Sir William Howard†).
In the second session he was named to two committees concerning the payment of debts, the first on 20 Mar.1606 and the second, specifically for the avoidance of double payment of debts recorded in shop books, on 18 Apr. 1606.
In the third session Bellingham was again appointed to consider the bill for the better satisfying of due debts (26 Feb. 1607).
In the fourth session Bellingham was appointed to the committee to consider a successful bill concerning the management of funds bequeathed for apprenticing poor children (27 March).
