Leighton was unpopular as governor. He developed the defensive capabilities of Castle Cornet, but to do so he imposed heavy taxes on the islanders. In 1588 he was sent as a diplomat to Henry III of France, and then served at the camp at Tilbury in the defensive moves against the Spanish Armada. For some years from 1595 he employed Thomas Cartwright as chaplain.[1]
Leighton served as Member of Parliament for Worcestershire in 1601. He died in Guernsey.[1]