The television presenter Davina McCall is joining hundreds of women for the Action DIVA Sussex bike ride. Five hundred cyclists are taking part in the event. The ride starts from the East Sussex National at Little Horsted near Uckfield.
Any money raised will go to the children's charity Action Medical Research.
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Charlotte Jackson beat leukaemia when she was 4. Now 9 she's cut off her hair and is donating it for other children having chemotherapy.