Until 1955, Britain's International factories produced only large tractors based on the Farmall models. At that time, the small McCormick International B250 was introduced, which was manufactured in Bradford at the former Jowett car factory. The design foundation was now sought from the German IH's DGD 4 model. The B250 was powered by a 2.4-liter swirl chamber diesel engine based on a petrol engine, producing 30 hp. It had 5+1 gears. At the time, advanced features included disc brakes, a differential lock, and hydraulics independent of the clutch.

In 1958, the B275 was introduced, which had 8+2 gears and an engine power increased to 35 horsepower. Initially, it was better equipped than the B250, but after the old model was discontinued, the tires were reduced in size and equipment was cut back, including the work light and ignition lock. From 1960 onwards, a 1000 rpm PTO was available as an option.

A further developed model from the same basic structure was the 40-horsepower B414 introduced in 1961. Its appearance was brightened with light-colored trim. The B275's hydraulics were quite basic and it was equipped with a spring-based draft control system. The B414's Vary Touch hydraulics included normal push-rod sensing and other functions similar to the hydraulics of competing brands. Problems with cylinder head gaskets in the diesel converted from petrol engines began to become acute as power increased.

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