Cheshire engineering company Oliver Valves took the top spot in the category for firms with a turnover between £25 and £50m.

The company, founded by chairman Michael Oliver from his garage in 1979, leads the world in designing and manufacturing valves for the petrochemical industry.

The largest privately-owned valve maker in Europe, it has a turnover of £42m, up from £38m in 2008/9, with 250 staff at its Knutsford HQ and another 600 around the world.

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