The letter, written to the Daily Telegraph, accuses the Government of “ploughing on regardless” of “overwhelming" opposition, and suggest that the consultation process lacks legitimacy.
According to the Daily Telegraph, around 137 Conservative MPs are expected to vote against the changes based on letters written to their constituents.
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Mr Kim has made two recent visits to China.
The study looked at the development of 422 children over the course of eight years.
The president said they will come into force if China refuses to change its practices.