What became Sentinel began life in 1875 as Alley & MacLellan based in Glasgow. The company  started producing steam road vehicles in 1906 when it introduced a five-ton vertical-boiler wagon, with a two-cylinder undertype engine and chain drive. During the First World War steam wagon production was moved to a new factory in England under a separate company Sentinel Waggon Works Ltd.

Alley & MacLellan's early wagon was so successful that it remained in production with relatively few updates until the launch of the famous Super in 1923. The Sentinel Super was assembled in a radical new plant at Shrewsbury, with a flow line based on the concept of the Ford Model T plant in the United States. Sentinel was a market leader until the 1930s when new legislation led to the development of lighter lorries.

This impressive model of a Sentinel flat bed lorry in 1:2 scale was displayed by Sam Forgrave at the Harrogate exhibition in 2012.

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