Thermoseal makes and supplies more than 2,500 components for insulated glass at four UK sites and exports them to 48 countries, with overseas sales hitting £3 million in 2019. Throughout 2020, it increased its stockholding and expanded capacity at its two-acre Wigan site in anticipation of Brexit. It is led by managing director Gwain Paterson, 58, whose father founded the business in a small Birmingham factory in 1979.
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