By Laura McGuire Marks and Spencer has beaten analysts’ expectations, posting a 58 per cent jump in profit before tax for the full year, as chief Stuart Machin reaps the benefits of the high street darling’s turnaround plans. Analysts had previously forecast a 35 per cent rise in underlying pre-tax profits to £653m for the year to April, with revenue growth of 8.9 per cent. The retail behemoth said revenue was up 9.3 per cent on last year figures to £13bn, helped by demand for clothing and food lines. Food sales grew 13 per cent as cash-strapped shoppers sought out its ‘Dine-In’ offer, Clothin…