Original: The Sony Radio Academy Awards : Winners 2004Sony Radio Academy Awards - Winners 2008 Costing # 71.4 million ( 2005/6 ) , BBC Annual Report and Accounts 2005/2006 , page 106 it is the BBC 's most expensive national radio network and is considered by many to be the corporation 's flagship .
Simplified: Radio 4 costs # 71.4 million a year , BBC Annual Report and Accounts 2005/2006 , page 106 and is the BBC 's most expensive national radio network .