Kate McCann, the mother of missing Madeleine, has asked for permission to give evidence at the libel trial of the Portuguese detective Goncalo Amoral.
Gerry McCann has already made the same request. The judge is likely to decide on November 5th.
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Dr Michio Hirano denied having any financial interest in the experimental treatment considered for the baby.
The measures are set to be included in a court-mandated clean air strategy the Government is due to publish on Wednesday.