Martin Lewis has urged Britons to “stock up” on a common £1.35p item ahead of the price hikes next week. From Monday, October 7, the cost of a standard first-class stamp will soar by 22 per cent, rising from £1.35 to £1.65. Britons are urged to act quickly and stock up on first-class stamps before a significant price hike takes effect next week. Lewis, founder of MoneySavingExpert.com, has long advocated for this money-saving strategy. He said: “For years, every time stamps go up in price I’ve suggested people stock up and bulk-buy in advance, as provided the stamp doesn’t have a price on it a…