BBC NEWS | UK | UK Politics | Tories beat Labour in by-electionThe Conservatives have won the Norwich North by-election with a majority of more than 7,000.
The winning candidate Chloe Smith, 27, will become the House of Commons' youngest MP when she takes her seat after the summer recess.
It was the first Westminster election since the MPs' expenses furore.
The former MP, Labour's Ian Gibson, quit when the party barred him from standing at the next general election over his expenses claims
Brown will not be happy.
Norwich has been in Labour hands for a decade