Peggy Wignall
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Liverpool Wren's Battle Of The Atlantic memories

Churchill said winning the Second World War depended on victory in the Battle of the Atlantic, which was won 70 years ago this month.

The campaign against the U-Boats was masterminded from a secret underground bunker in Liverpool which is now a museum.

Peggy Wignall from Llandudno was a teenage Wren worked in the officers' wardroom.

She makes an emotional return to the nerve centre of Britain's fight for survival.