From 29 August, vehicles driving anywhere in the capital which do not comply with emissions standards will be liable to a £12.50 daily charge
Christina Calderato, TfL’s Director of Transport Strategy and Policy, was on BBC Radio London's Eddie Nestor's show taking questions from listeners
Yasmin Rufo
BBC London News
The phone-in has now come to an end, but there is plenty more Ulez content on our website.
You can find all of BBC's London Ulez coverage here.
You can also listen back to Eddie's Q&A with Christina Calderato on BBC Radio London.
All of our Ulez radio coverage can be found on BBC Sounds.
The live page was run by myself, Yasmin Rufo, and edited by Rebecca Cafe.
Tom Edwards
Transport Correspondent, BBC London
What the phone-in showed is there is a level of anxiety among some Londoners about these big changes to driving in London.
Probably the caller that summed it up was George from West Wickham, south-east London, who has struggled to apply for scrappage as the letters are too complicated for him.
Others complained the website for scrappage applications, external was also too difficult.
There is a sense some have fallen through the cracks, particularly those who cannot access the application forms which are all web-based.
Callers in desperate situations were told they wouldn’t get specific help – although they would be eligible for scrappage.
And people asking about retrospective scrappage wouldn’t get any cash.
What it shows is TfL say they are ready for the operational implementation but there are bound to be people who feel this scheme makes their lives much more difficult.
BBC Radio London has been putting your listeners' questions to Christina Calderato, TfL's director of transport strategy and policy.
She has been answering your questions on the expansion that will come into force on 29 August.
She tells Eddie: "I hope to support people with the information they need and help them understand the process."
If you need more help, contact the TfL centre on 0343 222 2222.
One question that cropped up during the phone-in was about the support available for shift workers.
Some are concerned they will have to pay the Ulez fee twice per shift as the scheme runs from midnight to midnight.
TfL say the impact of Ulez on shift workers was considered, but "the amount paid by people who work shifts that go over midnight on consecutive days should be similar to people working on consecutive day shifts".
Ms Calderato explained that those who work shifts would pay twice on the first day of their shift, however if they work consecutive days, then they wouldn't have to pay for their commute in on the next shift as it was the same day so it would work out that they'd paid the same amount.
One caller said her elderly father was so worried about Ulez that he suggested breaking the camera near his street. She said she talked him out of it but that it showed how upset he was that her father, a law-abiding citizen, was so upset about it.
Recently, we reported that over the four months since cameras started to be installed in the outer boroughs for the expansion, the Met Police received 339 reports of camera cables being damaged, or cameras being stolen or obscured.
This number could be even higher as one report can represent multiple cameras.
Residents have been collecting information of the amount of damaged or stolen cameras. Here, the blue pin signifies a damaged camera and black, stolen.
This map indicates about 500 cameras that have been stolen or damaged, according to their unofficial data.
Image source, Chris BrownBlack pins relate to stolen cameras and blue pins show damaged cameras
We're nearing the end of the phone in and Ms Calderato has a final few answers to Eddie's questions:
Yasmin Rufo
BBC London News
Ms Calderato, TfL's director of transport strategy and policy, insists that nine out of ten vehicles in outer London are compliant.
This claim is based on data gathered from 106 cameras in outer London.
She says the data, available on TfL's website, external, has been verified by the Office for Statistics Regulation.
Image source, PA MediaHowever, the BBC has investigated this claim and found that as many as one in six cars are non-compliant.
This is based on figures from the Society of Motor Manufacturers and Traders using information about cars registered to addresses in outer London.
It shows 84% of cars in outer London comply with emissions standards, which means that at least 280,000 cars do not.
You can read more about the analysis behind non-compliant cars here.
Sarah calls in to tell TfL that the scrappage scheme application is difficult, especially for her elderly father who is not digitally savvy.
"I'm not surprised that there is money left because it's virtually impossible to claim from the scrappage scheme," she says.
Ms Calderato replies saying making the website easy to use, external is "a difficult balance to get right as we want people to have information so they know if they are eligible".
She adds that applications for the scrappage scheme are being turned around quicker than 10 days, but in the meantime "people may have to reconsider journeys".
Mrs Calderato says TfL has 'continued to listen' to people
Ross, who lives in London, says he has already sold his car and received just £500 for it. He has used a large part of his retirement fund to purchase a new car. He wants to know why he cannot get a backdated payment now the scrappage scheme is open to everyone.
"We have a limited pot of money and we wanted to target the people most in need first.
"Now there is money left, we are thinking about how we can use it to support the most number of people," says Ms Calderato.
Eddie challenges her, saying that the scheme was opened to all just one week before the expansion and it was due to political pressure.
Ms Calderato says that is not the case and insists it was because TfL has "continued to listen" to people.
Eddie asks if people will be able to challenge fines if they think they were not properly warned about entering the Ulez zone.
Ms Calderato says that won't happen as there "will definitely be signage on the boundary".
As well as boundary signage there will be "advanced directional signs on the national highways coming in to London".
She also urges listeners to sign-up to an Auto Pay account, external on the TfL website. This means you will automatically be charged £12.50 if you enter the zone and "will never receive a PCN".
There is no registration fee for an auto pay account.
Image source, TfLGeorge, 81, has a non-compliant car and says he doesn't understand what he needs to do ahead of the expansion.
Ms Calderato replied that there are a number of ways TfL can help George.
She said he may be eligible for an exemption or grace period depending on his circumstances. It is also likely he can get a grant from the scrappage scheme.
"The best way for George, and other people who are unsure about how to scrap their vehicles, to get help is to call the TfL contact centre, external on 0343 222 2222.
"By calling that number, someone can talk you through the process and help you fill in any necessary forms."
Image source, Getty ImagesCurrently, Londoners with non-compliant vehicles can claim a maximum of:
From 21 August:
*Small businesses are defined as those with fewer than 50 employees
One caller has asked TfL about more information on retrofitting. He says that the retrofitting grant from TfL does not cover the full cost and the centres are not near to where he lives.
Ms Calderato replied that TfL has increased the grant from £5,000 to £6,000 to help people cover the cost.
On the location of the retrofit centres she says there is one in Cricklewood and a further two in Luton.
"Retrofit numbers are currently very small and there is spare capacity at these centres," she adds.
"Historic vehicles that are over 40 years old are exempt from Ulez charges," says Ms Calderato.
She says this is because these cars are not driven often and cannot be easily replaced.
If you have a question about Ulez for TfL then get in touch with Eddie Nestor.
You can call, text or WhatsApp his show on 0800 731 2000.
You can also email Eddie@bbc.co.uk
In response to Lyn, Ms Calderato says TfL has an NHS reimbursement scheme in operation, external.
The scheme means anyone who is too unwell to travel on public transport to appointments will be reimbursed for any Ulez charges. This is regardless of whether they live in London.
However in Lyn's case, as she is receiving palliative care there are no further exemptions for her daughter, who is her carer.
Lyn from Kent is the first caller who tells Eddie she has terminal blood cancer.
Her daughter, who is her nominated carer, does not have a compliant car so will have to spend £12.50 a day to visit her.
Lyn says the scheme has ruined all calmness she has at the end of her life.
How can TfL help her and her daughter?
Yasmin Rufo
BBC London News
We start off with Ms Calderato telling Eddie that the transport authority is ready.
"We want to make sure now that Londoners are ready so they have the info they need," she said.
"We have to keep listening and adapting, opening up scrappage to more people."
Tom Edwards
Transport Correspondent, BBC London
I'm getting asked a lot of questions on the Ulez expansion - many of them are repeat questions and so here are some answers.
You can also listen to me answering queries about the scheme on BBC Radio London.
Remember this is best guidance and more information is available on the Transport for London (TfL) website., external
Yasmin Rufo
BBC London News
Ulez has proven to be very controversial with arguments debating its impact on air quality to exactly how many vehicles are compliant.
The BBC has been assessing some of the claims made about London Mayor Sadiq Khan's flagship clean-air policy.
You can read our analysis here.