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 robbers casually approached their victim on a busy high street before before spraying a noxious substance in his face.
Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.