Theresa May’s proposed new economic partnership with the EU “will not work”, the head of the European Council has said.

Donald Tusk said the plans risked undermining the EU’s single market.

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The west’s leading economic thinktank has warned that the expansion in the global economy may have peaked after cutting its growth forecasts for an array of rich and developing countries.

In its latest update on the health of the world economy, the Organisation for Economic Cooperation and Development (OECD) said the outlook for both 2018 and 2019 was less good than it had predicted in May.