NHS facing biggest ever challenge, says new boss

The NHS is facing the biggest challenge in its history because of the squeeze on its budget, says its new boss.

In a speech on his first day as NHS England's chief executive, Simon Stevens, will say the health service is enduring the most sustained "budget crunch in its 66-year history".

He will warn navigating the next few years will require a huge effort.

Branwen Jeffreys reports.