Co-founded by chairman John Simpson, 75, in 1971, this company supplied lighting for the first production of cult musical The Rocky Horror Show. The London business has diversified into audiovisual services and staging for the theatre, concerts and other events — in 2015 it bought video and lighting specialist Shock Solutions for an undisclosed sum. In 2016, White Light won a large deal with a theme park in the Middle East, which boosted overseas sales to £6.8m last year.
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