Residents of an iconic Kent building have been left feeling “insulted” after an election leaflet elsewhere in the country used it to represent Croydon. Arlington House in Margate features on Conservative campaign literature distributed in Surrey designed to suggest the Lib Dems want to build high-rise housing. It bears the message: “Don’t let the Lib Dems turn Leatherhead into another Croydon.” But residents of the tower block 85 miles away on the Thanet coast say it is in fact “a fine example of brutalist architecture”. The leaflets were distributed as part of the Tory election campaign in Ma…