The Prime Minister vigorously defended his so-called controversial 'bedroom tax' in an interview with ITV News. Asked if it was fair that children "bear the brunt of this kind of policy", he said:
"There is a human impact on the entire country that we currently spend £23 billion a year on housing benefit, that is more, to put it in context than we spend on the entire transport and home office budgets.
"We only spend £33 billion on our entire defence system for the UK. So it's not sustainable to go on with a housing benefit system and a benefit system."
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Transport Secretary Chris Grayling believes Network Rail should share the responsibility with private train operating companies.
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Elliott Livingstone, aged three, spent most of his life in hospital before the operation in April.