Founded in 1998 by father and son David and Mark Aston, 71 and 44, this firm specialises in recovering metal from the bottom ash from incinerators. Its two main processing lines ran throughout 2019, which helped to boost profits 340 per cent to £6.1 million in 12 months. It was acquired by private equity firm Waterland at the end of that year. It is headquartered in Dudley in the West Midlands. Managing director Paul Knight, 50, is focusing investment on advancing the tech used by the firm.
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