Possible Clues:

• U.K. network, with 'the'
• Colloquial name for the BBC
• English broadcaster, with 'the'
• Brit. Broadcasting Corp., familiarly (with "the")
• Colloquial name for Britain's biggest broadcaster
• Big name in British news, with 'The'
• Network on the telly, with "the"
• Auntie?
• Overseas network, with "the"
• Whence 'The Office,' with 'The'