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Yep, under UK law carrying any lockable blade in a public place is illegal. You can have something with you for work, so say for example you were a carpet fitter and you had a Stanley knife with you while travelling home from work - you could prove that it was legitimate.
However, it has to be straight from home to work so if you stopped off at the pub for a swift pint on the way home and got searched you could get done.
must be non lock-able to be legal-able ,no?