Sunday share tips: Tullow Oil, AstraZeneca, Aviva
It may be time for Aidan Heavey to step aside at Tullow Oil. The former accountant, 59, is rightly feted as one of the oil industry's great entrepreneurs. Beginning with a tiny start-up in 1986 the Irishman turned Tullow into one of the most successful explorers in the world. Its 10.7bn pound market
