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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The mayor hinted that certain cars could be entirely banned from London's streets in an effort to combat the city's "toxic" air.
The house built in the 1850s has three-bedrooms and two roof terraces.
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