Two of the Czech Republic's leading brewers are to raise beer prices early this year, according to the country's local press.   The Plzensky Prazdroj (PP) brewing group will raise the prices of all its beers by up to CZK1 per half litre in early February, with the largest increase in its flagship Pilsner Urquell brand, which will increase by CZK 1 to CZK 13.90 per half litre of kegged beer, and by CZK 1 to CZK 16.90 per half litre of bottled beer.