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George and Daphne Burnett
Construction equipment
Rank 2017
34
Worth
£185m
Rise/fall
£30m

Scottish accountant Burnett, 70, retired in 2006 after building Ashtead, a Surrey-based plant-hire business, into an international operation. He and his wife Daphne have a stake worth £80m, a rise of £30m over the past year, along with other assets.