Urgent appeal for blood donors as stocks run low

The NHS is appealing for people to donate blood because of low stocks caused by the bad weather.

The NHS Blood and Transplant Service said stocks of O negative have fallen below "preferred levels".

O negative is an a key blood type because it can be given safely to patients in other blood groups.

The BBC's medical correspondent Fergus Walsh, who has O negative blood visited a blood donation session in London.

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