Professor Fugger from the Medical Research Council Human Immunology Unit said the fact the drug was already licensed would speed up the process of getting the treatment to patients should it be prove effective.

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However, the firm needs approval of Health Inspectorate Wales to work in Wales, a process that could take six weeks, and on Thursday discovered that it would not be licensed in time for Saturday's promotion in the Carmarthenshire town.

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Alternatively, herbal medicines can be licensed in the same way as pharmaceutical drugs but Mrs Croft said this is a costly and time-consuming process.

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