NHS boss refuses questions as he arrives for NHS expo

Sir David Nicholson refused to answer questions from journalists as he arrived at the NHS conference this morning.

Read: Under-fire NHS boss to make keynote speech.

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Nicholson 'committed' to NHS

Under-fire NHS chief Sir David Nicholson has said he is "absolutely completely committed" to the NHS but has refused to answer questions about his future after he was criticised for his role in the Mid Staffs hospital deaths scandal.