Eurostar have said snow and ice in the UK and northern France were leading to speed restrictions and delays on all its trains.
Six services were also cancelled, with customers told they could exchange their tickets for another date.
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The PHE will review the evidence and also make recommendations on how to address the issue, according to health officials.
The Commons Public Accounts Committee (PAC) said at least £9 million has been squandered on a project that failed to deliver.
A top temperature of 11 Celsius (52 F).