A vote to Leave would have to be respected, he said, "but the gravediggers of our economy will have to account for what they had said and done."
Decision time in Britain →
"Whilst prime ministers have come and gone, celebrities have come and gone, life has changed, she and the monarchy have been an absolute constant in their lives and I think that is very reassuring," he said.
Queen Elizabeth II surpasses Queen Victoria's long reign →
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