Slaters They have loads of leg lengths in stock and will let down jacket sleeves if you have mutant gibbon arms like my bloke.
if you've got a car, travel to 'Dewhirsts' - it's the company that manufacture for Marks and Sparks. They sell end of line, 2nds, discontinued stocks that Markys don't want... u can get the 'SP' designer range of suits for like £20-£30... there's 1 at North Seaton, Sunderland, Peterlee, Redcar...