The imposition of tariffs ups the pressure on May’s minority Conservative government which depends on backing from the small Northern Irish Democratic Unionist Party (DUP) for their majority control of the British parliament.
Bombardier is the single largest manufacturing employer in Northern Ireland. The DUP’s leader Arlene Foster said the ruling was not the end of the process. “There are further steps that will follow,” she said in a statement.
Britain’s business ministry said it would continue to work closely with the Canadian government to encourage all parties to reach a credible resolution as quickly as possible. It also criticised Boeing’s role in the dispute.
“Boeing’s position in this case is unjustified and frankly not what we would expect of a long-term partner to the UK – as well as damaging the wider global aerospace industry,” a spokeswoman for the department said.