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JR Catchpole, co-author of the paper and a space law expert at Foot Anstey LLP, said:

Singer James Morrison's partner, Gill Catchpole, has been found dead.

Ms Catchpole was found in her home in Whitminster, Gloucestershire, on Friday morning.

Virus expert Dr Andrew Catchpole says pigs are a common source of newly emerging flu strains, because they can catch flu viruses from humans and birds which then mix and make new versions.

They have since made a full recovery, but that fact alone does not really tell us anything about the transmission potential of the virus or the risk to vulnerable groups, says Dr Andrew Catchpole, a virus expert who works for a research organisation called hVIVO.