Fisher v Bell [1961] 1 QB 394

James Bell displayed a flick knife in the window of his Bristol shop. A ticket behind the knife described it as an ejector knife and stated a price of four shillings. Chief Inspector Fisher brought a prosecution under section 1(1) of the Restriction of Offensive Weapons Act 1959. The provision made it an offence to manufacture, sell, hire, offer for sale or hire, lend or give specified knives. The justices found that the knife was a prohibited weapon but dismissed the information because displaying it in the window did not constitute an offer for sale in contract law. The prosecutor appealed by case stated, contending that the statutory words should bear their ordinary meaning and cover a display plainly intended to attract buyers.

Did displaying a priced flick knife in a shop window amount to an offer for sale within section 1(1) of the Restriction of Offensive Weapons Act 1959?

The Divisional Court dismissed the prosecution's appeal. Lord Parker CJ held that the phrase “offer for sale” carried its established legal meaning. Under ordinary contract law, displaying a priced article in a shop window is an invitation to treat, inviting customers to make offers; it is not itself an offer that a customer can accept to conclude a sale. The Court acknowledged that ordinary usage might suggest the knife was being offered, but it could not extend the criminal provision beyond the language Parliament had chosen. Other legislation used the wider expression “offers or exposes for sale”, reinforcing the distinction. Because section 1 mentioned an offer but not exposure for sale, Bell had not committed the charged offence.

A shop-window display with a price is ordinarily an invitation to treat rather than a contractual offer. Where legislation uses a technical expression such as “offer for sale” without defining it more broadly, the court may apply its established legal meaning, particularly in construing a criminal offence that cannot be enlarged by judicial addition.

The case is a standard illustration of invitation to treat and of the presumption that Parliament uses settled legal language deliberately. It follows the retail analysis in Pharmaceutical Society v Boots and aligns with Partridge v Crittenden on advertisements. Parliament responded through the Restriction of Offensive Weapons Act 1961, which extended the law to exposure and possession for sale or hire. The contractual principle remains useful because it identifies when the seller retains the choice whether to accept a customer's proposed purchase.