UK food retailer Big Food Group has posted a 14% increase in first-half pre-tax profit, boosted by an improved performance at its Iceland frozen food chain. The company reported pre-tax profit of £5.6m (US$9.3m), compared to £4.9m a year earlier. Profit before tax, goodwill amortisation and exceptional items rose sharply to £15.9m from £6.6m a year earlier.