The Duke of Cambridge said he was, "feeling a mixture of pride...and excitement at what this means for sport and opportunities in this country as a whole."
He was speaking at the opening of the new St George's Park football training centre.
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The £55.7 billion project will “fundamentally” change how Britons view rail travel, the Government-backed firm behind the scheme says.
Judd’s lawyer called Weinstein’s arguments “offensive”.
Mrs May will meet business representatives on the Northern Ireland side of the border on Thursday afternoon.