THE BRITISH REGIMENT--The Montreal 'Commercial Advertiser,' says:--Colonel Austin, of the much talked of British Regiment of New York, has returned to Canada a poorer and no doubt a wiser man. It appears from his statement that there never [was] any British regiment; the whole thing was a monstrous lie and fraud, not eighty having offered for it. Nor was there any pay forthcoming, and the Colonel after proceeding to Washington, and vainly supplicating the authorities there for his expenses, concluded to scede from a service which promised neither profit not honor. Some of his companions who were without means of their own are unable to return, being kept in pawn by inexorable hotel-keepers. So ends the farce of the British Regiment.