Founded in 1974, Mark Group provides loft and cavity wall insulation to more than 250,000 homes a year in Britain. Lee Cottingham, 38, took over the Leicestershire firm from his father, John. It now operates more than 30 distribution centres worldwide, installing renewable energy technologies from solar electricity to heat pumps. Sales grew 27% to reach £242m in 2013, and profits increased sixfold to £17.1m.
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