Public urged to hand in zombie knives ahead of ban Owners of the weapons will have four weeks from 26 August to surrender them to police. #press https://www.bbc.com/news/articles/cd05v5kk3neo?utm_source=press.coop https://ichef.bbci.co.uk/ace/standard/240/cpsprodpb/750b/live/10304620-5dce-11ef-8f57-71dfbc244434.jpg