The Rugby Football Union has welcomed the IRB's latest statement, with chairman Bill Beaumont confirming urgent work continues towards a solution.
Beaumont said: "Our primary focus should be to maintain a genuinely pan-European tournament. Rest assured I am working closely with RFU chief executive officer Ian Ritchie and other stakeholders to find a solution.
"I welcome the support of the IRB in helping to ensure that this happens and, of course, as a member union abide by and support the IRB regulations."
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