Papers of John Wilkes

John Wilkes, it is well known, sent to the newspapers copies of Lord Weymouth's and Lord Barrington's Letters respecting the riots in St. George's Fields in 1768. We Can easily conjecture how he did or how he might have, got possession of a copy of Weymouth's Letter, which was addressed to the magistrates of Surrey; but Barrington's letter was strictly official, and directed to the "Field officers, in staff waiting, for the three regiments of Foot Guards." Has the circumstance ever been explained? If so, where? Can any of your readers inform me the *exact date* of the first publication of Barr…