Jackson Carlaw, the Scottish Tory leader, promised to lobby Whitehall on behalf of the policy’s critics

Scottish Conservatives are privately “livid” about Boris Johnson’s new immigration plans, The Times has been told, as care providers and food producers condemned the new system.

Warnings were sounded yesterday that the Home Office proposals to stop providing visas to low-skilled migrant workers as part of a shift to a points-based system would damage Scotland’s economy.

Donald Macaskill, chief executive of Scottish Care, which represents hundreds of private care homes, said UK ministers were living “in cloud cuckoo land”, while the Scottish Tourism Alliance said that the plans were a “major threat to Scotland’s tourism industry”.

Jackson Carlaw, the Scottish Tory leader, promised to lobby Whitehall on behalf of the system’s critics.

A source in the Conservative group at Holyrood said that “most