NHS savings 'a very tough ask', says former boss

The NHS is facing a "substantial financial problem" which politicians are ignoring in the election campaign, the former head of the service says.

Sir David Nicholson, who retired last year, told the BBC the NHS in England was accruing large deficits which would become "crystal clear" later this year.

But he said instead of talking about how to address these, politicians were focusing on expanding services.

He said the situation caused him "very great concern".

Hugh Pym reports.