Liberal Democrat ex-cabinet minister Michael Moore is introducing a backbench bill to make it a legal requirement that at least 0.7% of Britain's GDP is devoted to helping poor countries, in line with a United Nations target.
The coalition government agreed to the amount last year, but the promised legislation has so-far failed to materialise.
The 0.7% pledge, in line with the UN target, has previously had the backing of all three major parties, but this is the first time it will be enshrined in UK law.
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