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Usually outspoken, Jean-Claude Juncker is having to go along with an order made by the UK Prime Minister which means the EU executive branch has to stay out of the Referendum debate, respected German magazine Der Spiegel said.

If there is a clear lead by the Brexit campaign in polls by the end of today - a week before the vote - then, and only then, can Juncker speak out.

It is thought by then it will be too late for him to influence the final outcome, but then nobody could accuse him of doing nothing to prevent Britain leaving the bloc under his watch.