David Cameron has signed the Lough Erne declaration, which, according to the government, "focuses on private enterprise, which drives growth, reduces poverty, and creates jobs and prosperity for people around the world."
The G8 countries aimed to reduce corporate tax evasion and the document says member countries must work on closing tax loopholes.
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The broadcast figure-turned activist died on Monday at her Los Angeles home from metastatic breast cancer, her family said.
Warm with some wet weather
Melissa Mead has been campaigning to raise awareness of sepsis after losing her one-year-old son William to the illness.