The average price of a pint of bitter in Britain's pubs could increase from around £2.20 to as much as £4 next year, the industry has warned. The massive hike, which is also expected to affect cans bought from off licences, is due largely to increased prices of key ingredients barley and hops - in part because farmland is being turned over to environment-friendly biofuels. But brewers are also suffering from rises in fuel costs and the price of the metals used to produce kegs and cans. Kegs are now so valuable that they have become a target for thieves,...