Unfortunately, the Gubbmint will undoubtedly just ban all penknives, so the innocent man who forgets about the penknife in his pocket from his camping expedition will get 5 years, whilst the little scrote who has just stabbed a pensioner with a carving knife will get a fine (which he won't pay) and community service (which he won't do) and get to keep all the pension money he stole from the stabbed pensioner. Cynical, moi?