[6] The business soon diversified, manufacturing goods ranging from soap and bicycle components to non-ferrous metals, but by the early 20th century it had developed particular expertise in metallurgy.

[6] During the Second World War the Witton site was used for the development and production of uranium for the Tube Alloys project.

[9] The name Imperial Metal Industries Limited (IMI for short) was adopted on the 100th anniversary of the firm in 1962.

[10] The company announced in October 2013 that a decade-long programme of transformation had been completed with the disposal of two non-core subsidiaries to Berkshire Hathaway for £690m.

[12] In November 2022, it was announced IMI had acquired the Blackburn-based smart thermostatic control manufacturer, Heatmiser, for £110 million.