G8 leaders in Fermanagh have signed a Lough Erne Declaration, which seeks to clamp down on tax evasion by companies at a global level.
The co-ordinated action is the first deal of its kind, but it is unclear how effective it will be. Business Editor Laura Kuenssberg reports.
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There was something very striking about the pact, which implies the new agreement could remain in place even if the prime minister does not.
The royal will visit the site of the deadly attack at Manchester Arena as he remembers those killed and injured.