Chancellor George Osborne wants to use Britain's presidency of the G8 summit this year to push international progress on the reform of international tax rules, which were first developed by the League of Nations in the mid-1920s and remain essentially unchanged.
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Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.
Between eight and 10 people have been rescued following the raid, according to Bangladeshi police.