Hodgson Brothers, a small undertaking, informed South African Railways and Harbours that it had a lorry to sell for 500 pounds. Negotiations ensued between the parties during which was the price was not disputed at any stage. SA Railways made a complete and definite offer to buy the lorry. Hodgson Brothers received the offer and accepted by post. Five days later, however, SA Railways sent a telegram notifying Hodgson Brothers that it had forgotten in their prior negotiations to mention that it would only pay 300 pounds for the lorry. Hodgson Brothers refused to accept, arguing that they had already agreed on the price. SA Railways contended that it had made a mistake.