Tory chairman Baroness Warsi on disappointing by-election
Labour has held its seat in the Feltham and Heston by-election with an increased majority.
Winning candidate Seema Malhotra secured victory with an increased majority of 6,203 over the Conservatives, a swing of 8.6%.
Turnout for the poll, following the death of Labour MP Alan Keen last month, was just 28.8% - the lowest in a by-election for 11 years.
The Tories finished second and the Liberal Democrats third.
Conservative chairman Baroness Warsi said the vote result was not unexpected but disappointing.