Speaking to NBC's Brian Williams, Mr Cook noted that key components in Apple products such as the iPhone were already manufactured in the US, but were then shipped out to be assembled.

BBC: Tim Cook

IPEC's principal researcher is Prof Brian Williams, Director of the Nursing, Midwifery and Allied Health Professionals Research Unit.

BBC: Nurse at desk

So it was natural that when he was interviewed by NBC, Brian Williams asked him about London's readiness.

BBC: Mitt Romney's Olympic mishap