My name is Sadiq and Im the mayor of London: Khan roars into Southwark Cathedral watched by his delighted children (but where was Jeremy Corbyn?)  Sadiq Khan was attending a swearing-in ceremony at Southwark Cathedral Khan received a standing ovation from crowd which included Ed Milliband Londons new mayor was introduced by Baroness Lawrence of Clarendon  Comes as Tory candidate Zac Goldsmiths campaign is roundly criticised 

Sadiq Khan has carried out his first official piece of business as Londons new mayor after attending a swearing-in ceremony at Southwark Cathedral.

The newly-elected mayor of London received a standing ovation from a crowd which included actor Sir Ian McKellen and former Labour Party leader Ed Milliband, but not current leader Jeremy Corbyn.

The first Muslim to hold the position, Khan was introduced by Baroness Lawrence of Clarendon, the mother of British teenager Stephen Lawrence, who was murdered in a racist attack in South East London in 1993.

The pair embraced as Mr Khan took to the stage, before addressing the crowd: My name is Sadiq Khan and Im the mayor of London.

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Sadiq Khan motions to his children as he enters the cathedral with The Very Reverend Andrew Nunn 

Sadiq Khan has carried out his first official piece of business as Londons new mayor after attending a swearing-in ceremony at Southwark Cathedral

Sir Ian McKellen greets the newly elected Mayor of London Sadiq Khan ahead of his signing ceremony

Labour leader Jeremy Corbyn, who was not present at the ceremony in Southwark, leaves his north London home today

Sadiq Khan holds hands with his wife Saadiya in Southwark Cathedral ahead of the signing ceremony for the newly elected mayor of London

Sadiq Khan speaks with Metropolitan Police Commissioner Bernard Hogan-Howe (right) and London Fire Commissioner Ron Dobson (left) following the ceremony

He added: I cant quite believe the last 24 hours. We are here in Southwark because I want to start how I intend to go on.

I wanted to do the signing here in the very heart of our city, surrounded by Londoners of all backgrounds, and Im so proud that my good friend Doreen Lawrence introduced me here today.

Mr Khan joked: Some of you may not know this but I grew up in a council estate just a few miles from here.

Back then I never dreamt I could be standing here. Im only here today because of the help that our city gave to me and my family and my burning ambition for our city, that will guide my mayoralty, is to ensure that all Londoners get the opportunities that our city gave to me

Sadiq Khan is embraced by a friend at Southwark Cathedral in London following todays ceremony

Mr Kahn shakes hand with one passer-by and waves to another, while somebody else takes a picture of him