Sadiq Khan marked his first six months in City Hall by celebrating the successes, but admitted there is still much to do before his changes can make an impact on London.

The Labour Mayor, who won a landslide victory in the May elections, pledged to make fundamental changes to the city's make up, including a serious investigation into the housing crisis and a travel fares freeze.

As he settled into the job and faced his first few weeks in the post, Mr Khan admitted "things cannot be fixed overnight".

But the former MP said he wanted to be a Mayor for all Londoners who will tackle the challenges he faces.

Here, we take a look back at his election pledges , and what he has achieved - or not - so far as the head of City Hall.

From housing to transport, what has the former Tooting MP achieved for the city since becoming Mayor?

Housing

It was a Mayoral elections "on housing" according to opposition Zac Goldsmith back in May - and there is no doubt the city's crisis is still Londoners' biggest concern.

Khan had pledged before the election to build 50,000 new homes in the first year, with half of those to be affordable homes.

However, with six months gone, this is far from being achievable, and the Mayor admitted he cannot set a target for affordable housing after assessing the situation upon being appointed.

A few changes have been made since an initial dig at former Mayor Boris Johnson "for leaving the cupboards bare" , including the launch of the country's first ever review into foreign property owners and where their wealth comes from .

The affordable housing market gained a victory when more land was secured from Transport for London which can be built on .

The Mayor said more transparency is needed as a growing number of Londoners fear they cannot get onto the property ladder

But Londoners have already been told they can't expect changes "to happen overnight", although there are plans to open a not for profit letting agency, preventing people from having to move regularly when landlords hitch up prices, as well as a database naming and shaming bad landlords.

Mr Khan said: "I want to be honest with Londoners from the start that it will take time to turn things around - we're starting from a position where last year the previous Mayor built the lowest number of affordable homes since records began."

Transport

One of the Mayor's key pledges was the promise to freeze rail fares for Londoners, something which he believes he has achieved in delivering.

However, when the announcement came, the Mayor came under scrutiny after the decision was only passed for Transport for London (TfL) fares, excluding thousands who commute into the city.

Londoners reacted angrily to the news , and although TfL said it was absolutely confident it could deliver the fares freeze, it was not good enough for many travelling from further afield.

Although Khan has urged the government to give City Hall control over suburban rail lines, that has yet to be addressed or accepted.

There have been some wins for the Mayor however, including the long awaited launch of the Night Tube, rolled out on the Central, Jubilee and Victoria lines.

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The hopper fare also came into force very quickly, allowing some of London's lowest earners to take two buses for the price of one within the hour.

Environment

There is no doubt London under Sadiq Khan has ambitious plans to tackle the dangerously high levels of air pollution, but whether they can be delivered is yet to be seen.

Key details of the plan to create the London Ultra Low Emission Zone include charging higher polluting vehicles in central London, and bringing forward the plans from 2020 to 2019.

Cars, vans and motorbikes not meeting set emission standards would have to pay £12.50 a day to enter it, and lorries, coaches and buses £100.

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Recently, the Mayor mentioned the issue of pollution in the London Underground network during the People's Question Time, saying there are specialists looking into how heat from underground can be re-used as energy.

However, these plans are yet to be put in place, and City Hall will be quizzing the Mayor heavily on the new policies before they come into place.

Economy

Doing the Mobot: Mo Farah and Mayor of London Sadiq Khan

Campaigning hard to remain in the European Union and experiencing defeat, the Mayor has not swayed from making it clear that London is open for everyone.

Launching his campaign #londonisopen, Khan visited Canada and the US to ensure country's know the city is open for business.

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In speeches to the City's leading businessmen and in interviews, Khan has been made it clear he has been fighting for a spot in Brexit negotiations, saying that although the city "shouldn't be independent" from the rest of the country, it does need to ensure students, thriving businesses and leading people in all fields that London can be their home.

How effective this is remains to be seen, but businesses have agreed with the Mayor that Brexit has left corporations uncertain about their future here and this needs to be addressed.

Crime and Policing

In the wake of terror threats increasing in the city, the British Transport Police has introduced a number of changes which Sadiq Khan has backed, including plans to have armed police patrolling the Underground between jobs.

The Metropolitan Police have also deployed an additional 600 firearm-trained officers to meet the counter-terror threat.

Other changes have included the Mayor putting a firm stop to neighbourhood police officers losing their jobs, something which was discussed during Boris Johnson's mayoral reign.

Khan has insisted every ward will have second PC to "bring back real, neighbourhood policing which the community needs".

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