Faye Barker is joined in the studio by Caroline Berger, who is looking for a blood donor to help her mother and Ann O'Leary, from the blood cancer charity Anthony Nolan.
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Reverend Simon Harvey from Islington lost his wife Jennifer to a sudden illness nine weeks ago.
Drivers will be forced to charge reasonable fares under plans to ensure tourists are not targeted by drivers trying to take advantage.
Robbie is Britain's first official bionic hound, after having his back legs strengthened with a state-of-the-art exoskeleton.