BORIS Johnson has admitted that a £111 a month Universal Credit payment is not enough to live on.

The PM was grilled on the case of a pregnant Scottish mother, who barely has enough to get by on despite waiting for her baby to arrive.

2 Boris Johnson admitted that the Universal Credit payment wasn't enough to survive on Credit: AFP or licensors

At Prime Minister's Questions today SNP MP Mhari Black raised the case directly with Boris, who promised to look into it.

She said: "After deductions including advance she is left with the grand sum of £111 to feed herself, heat her home and get ready for her baby...

"In principle, as the PM, does he think that £111 a month is enough for anyone to live on?"

Boris said he would "do whatever we can" to help the mum in her time of need, but defended the flagship benefits system in front of MPs in the House of Commons.

More than 200,000 people have been helped into work through Universal Credit, he argued.

"I am proud to stand by our record helping people into work and off welfare," he said.

But his answer to whether it was enough to live on, he added: "The answer to her question is, in a word, no."

Brits are entitled to help with advances when they first go onto the flagship programme, but these get deducted from other payments later on down the line.

You can get up to £1,900 a month of help on Universal Credit, but the specific amounts differ on circumstances including whether you're working, if you're a single parent, and where you live.

And the DWP can take extra cash off payments to pay back debts and other loans too, leaving many struggling to make ends meet.

The six-in-one benefits system is now in place across the whole of the UK, but several million are still set to move onto it.

The project is years behind schedule and has been beset with issues.

The Sun has been campaigning to Make Universal Credit Work, lobbying ministers to let Brits keep more of what they earn, get upfront childcare costs, and to scrap the five-week wait for help.

2 Mhairi Black grilled the PM about her own constituent in Scotland, who was struggling after having several deductions form her payment Credit: PA:Press Association

Universal Credit calculators TRYING to work out how much Universal Credit you can get can be overwhelming. There are so many different elements that can affect your claim that it makes the whole process even more complicated. There are a number of free calculators that you can use to help you get an estimate, such as Gov.uk, Citizen's Advice,MoneySavingExpert, StepChangeand Turn2Us. You will need: Details of all your income, such as existing benefits, tax credits, earnings from employment and your pensions,

Details of your partner's income if you're married, in a civil partnership or living with someone as a couple. You will be assessed as a couple'

Information on any savings you have,

How much you pay in Council Tax per year and whether you get any discounts, reductions or exemptions,

Details of your rent or mortgage payments,

Employment and income information about anyone else living with you, such as grown-up children,

Details about your Carer's Allowance if you receive it. You need to make sure that the information is as accurate as possible so that you can get the truest estimate.

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Ministers have hinted that more changes to the system are on the way.

Earlier this month DWP minister Will Quince said he was speaking to the Chancellor about extra cash for Universal Credit.

What to do if you have problems claiming Universal Credit IF you're experiencing trouble applying for your Universal Credit, or the payments just don't cover costs, here are your options: Apply for an advance - Claimants are able to get some cash within five days rather than waiting weeks for their first payment. But it's a loan which means the repayments will be automatically deducted from your future Universal Credit pay out. Alternative Payment Arrangements- If you're falling behind on rent, you or your landlord may be able to apply for an APA which will get your payment sent directly to your landlord. You might also be able to change your payments to get them more frequently, or you can split the payments if you're part of a couple. Budgeting Advance - You may be able to get help from the government to help with emergency household costs of up to £348 if you're single, £464 if you're part of a couple or £812 if you have children. These are only in cases like your cooker breaking down or for help getting a job. You'll have to repay the advance through your regular Universal Credit payments. You'll still have to repay the loan, even if you stop claiming for Universal Credit. Cut your Council Tax - You might be able to get a discount on your Council Tax or be entitled to Discretionary Housing Payments if your payments aren't enough to cover your rent. Foodbanks - If you're really hard up and struggling to buy food and toiletries, you can find your local foodbank who will provide you with help for free. You can find your nearest one on the Trussel Trust website.