By City AM reporter Shrinking mouthwash bottles, fewer teabags and sausages with less pork are among downsized and downgraded supermarket products as manufacturers and retailers cut costs, a watchdog has found. Which? found that Listerine Fresh Burst mouthwash shrank from 600ml to 500ml but went up in price by 52p at Tesco, meaning shoppers paid 21 per cent more for 17 per cent less – or an increase to the unit price per 100ml of 46 per cent. PG Tips The Tasty Decaf Pyramid tea bags went from containing 180 teabags to just 140 at a number of supermarkets. Among downsized products were Andrex F…