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Alastair Salvesen and family

Shares in the Glasgow-based plant hire group Aggreko soared in 2006-07, valuing it at £1.2 billion. Aggreko demerged from Christian Salvesen in 1997 but the Salvesen family, led by Alastair, 65, retains stakes in both businesses, worth about £130m in total. It has other assets.