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Mother's head injury wipes 20 years of memories

15 August 2012 Last updated at 13:54 BST

A bang on the head has wiped 20 years from the memory of a mother from Cambridgeshire who cannot even recall the birth of her youngest son.

Kay Delaney, who hit her head when she slipped at work, is still shocked when she sees her older self in the mirror and her adult children are like strangers to her.

Charity Headway Cambridgeshire said Ms Delaney's case of retrograde amnesia was very serious.