In his TV interview with Andrew Marr on 1st December, the Prime Minister argued that;

 

"There are 400,000 fewer children in poverty than there were in 2010."

 

This claim is not supported by the UK government's 'poverty' statistics published as part of the annual Households Below Average Income (HBAI) series see table below. 

The Joseph Rowntree Foundation report on poverty found that:

• Child poverty has been rising since 2011/12; 
• 4.1 million children are living in poverty, a rise of 500,000 in the last five years; 
• Four million workers are living in poverty –a rise of more than half a million over five years; and 
• In-work poverty has been rising even faster than employment, driven almost entirely by increasing poverty among working parents. 

and https://www.jrf.org.uk/report/uk-poverty-2018.