Because knife law in the UK is partially down to the cops interpretation (ie you need to have a reason to be carrying any knife) I always assumed a penknife looks like the sort of thing you'd have in your pocket whereas a single blade might be more questionable even if it is within the acceptable limits.
Because knife law in the UK is partially down to the cops interpretation (ie you need to have a reason to be carrying any knife) I always assumed a penknife looks like the sort of thing you'd have in your pocket whereas a single blade might be more questionable even if it is within the acceptable limits.