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Labour's Rosena Allin-Khan has been elected as MP for Tooting.
Dr Allin-Khan increased Labour's majority to 6,357 over the Conservatives, up from the 2,842 secured by her predecessor Sadiq Khan in the general election last year.
In a sombre statement following her victory at Wandsworth Town Hall, Dr Allin-Khan paid tribute to Jo Cox, who was killed in her Batley and Spen constituency on Thursday.
My thoughts and prayers are with Jo's husband and her children. She was a proud and passionate campaigner who will be desperately missed.
Jo's death reminds us that our democracy is precious but fragile. We must never forget to cherish it. Thousands of people voted today and we are all here in recognition of our democratic values."
The vote in Tooting was held to find a replacement for the London Mayor who stood down after defeating Conservative Zac Goldsmith in the City Hall contest in May.
Labour councillor and junior doctor Dr Allin-Khan was born and raised in the area. She works as an emergency doctor at St George's Hospital and is also deputy leader of Wandsworth Labour group.
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A survey of Londoners shows the current thinking in the capital is to vote to stay in the European Union.Read the full story ›
Prime Minister David Cameron and newly elected Labour mayor of London Sadiq Khan have said they will work together to ensure the UK votes to remain in the European Union.
Speaking at the launch of the Vote Remain battle bus at Roehampton University in London, Cameron hit back at the Leave campaign by saying it would be "some conspiracy" for the Tory son of stockbroker and the Labour son of a bus driver to join forces over the EU.
He said: "We say [vote remain], not because it's part of some massive establishment conspiracy... because we say this matters so much for this country".
"We love our country. We want our country to be the best it possibly can", he added.
Sadiq Khan echoed Mr Cameron's statements and dismissed criticism of their surprising partnership by stating he would work closely with the Tory government "where it is in Londoners' interests".
"There are many things upon which the Prime Minister and I will disagree, but what's really important... is the Mayor of London and the Government to work closely together", he said.
"We are both on the side of London, we are both on the side of the United Kingdom. I want that spirit of unity of purpose to be with us today."
London mayor Sadiq Khan and Prime Minister David Cameron both gave speeches in Roehampton at the arrival of Britain Stronger In Europe bus.Read the full story ›