Bigg was the eldest son of Sir Thomas Bigg, member for Evesham in 1604. After studying at Oxford he was admitted to the Middle Temple in May 1597, where he was bound with (Sir) Benjamin Rudyard*. He seems to have spent over five years at the Inn, as in June 1602 he was appointed to help provide the reader’s feast.
Bigg undoubtedly owed his election at Evesham in 1614 to his father’s local prominence. He does not appear in any of the surviving records of the Parliament. Elected an alderman and town magistrate in his father’s place in October 1614, by the end of the year he had been appointed to the county bench.
