"(1) Subject to subsections (4) and (5) below, any person who has an article to which this section applies with him in a public place shall be guilty of an offence. (2) Subject to subsection (3) below, this section applies to any article which has a blade or is sharply pointed except a folding pocketknife. ... (4) It shall be a defence for a person charged with an offence under this section to prove that he had good reason or lawful authority for having the article with him in a public place. (5) Without prejudice to the generality of subsection (4) above, it shall be a defence for a person charged with an offence under this section to prove that he had the article with him— (a) for use at work ..."
"... he occasionally worked for his uncle in construction business and used the knife to cut the straps off the boxes. He said he last worked on the Monday and he found the knife in the shop and used it some twenty minutes to remove the straps of the boxes. He then placed the knife in his jacket pocket. He explained that he worked in cold temperatures and wore his jacket. His uncle dropped him home and upon entering his home he placed his jacket straight in his wardrobe. He also gave evidence that following this he remained at home for some two days. Subsequently on Tuesday his cousins arrived from Birmingham and they made plans to meet up from 7 to 8pm. When they arrived to collect him from home the appellant hurriedly grabbed his jacket and left to watch a film at the Feltham cinema. He stated that whilst watching the film he realised the knife was in his pocket and immediately told his cousin and made plans with his cousin to return home and drop the knife. However en route the appellant and his cousin decide to pick up [another] cousin."
"On31st December 2008 at London Road, Harjinder had with him in his possession a lock knife, in a public place. The reasons put forward by the defence are raised as a defence in law, that the defendant possessed the article for reasons for use at work. We note certain factors raised including that Harjinder was in casual work on the day for his uncle, and used the lock knife, and subsequently had forgotten that he placed the knife in his jacket. We note that the law states that forgetfulness in itself is not a 'good reason' in defence, but that other factors must also be considered in deciding whether the accused has proved its defence of 'good reason' on the balance of probabilities. We note that you said you used the knife at work but we further view this as 'casual' based work with your uncle and at the time you did not require to use the knife on a regular basis for work. There has been no evidence to suggest this. After leaving work premises you went home and forgot as you claim." [That seems to me to be an important finding accepting the truthfulness of the appellant's evidence]: "
"We have set out the whole of that passage [that is the passage in Gregson] to demonstrate the reasoning, which we do not find entirely persuasive. If the defendant had a good reason for having the knife on him six days earlier, when did that good reason cease? Did it cease as soon as he returned home from work? What if he called at a public house on the way? What was it about the new statutory wording which prevented the tribunal of fact from considering not only the alleged forgetfulness but also the reason given for the knife being where it was, and the time involved, when deciding whether or not the defendant had established the statutory defence? If Gregson was rightly decided, it would seem to follow that a parent who, having bought a kitchen knife, put it in the glove compartment of a car out of reach of a child, and then forgot to retrieve it when he arrived home would be committing an offence next time he drove the vehicle on a public road. That does not seem to us to be what Parliament intended."
"Accordingly in our judgment where a defendant does seek to rely on section 139(4) the fact finding tribunal should be left free to consider whether in the circumstances the defendant has shown that he had a good reason for having the article with him in a public place. If forgetfulness is relied upon it does need to be said that alone it cannot constitute a good reason, but otherwise no legal direction is required."