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Its organisers hope its schedule might co-exist with the men's international rugby calendar in the northern hemisphere, however it would put it on a collision course with domestic rugby in Europe.

That would set ministers on a collision course with trade unions and - government insiders privately concede - make a new wave of strikes possible.

The move puts the mayor of London on a potential collision course with ministers in his own party, after the chancellor backed plans for the expansion of the airport in January.

The US already appears set on a collision course with China, which was its third biggest supplier of imports last year.

Several also said the Democrats on the committee had just put California’s education funding on a collision course with the Trump administration.