... The Facts (paragraphs 17-24):
"The applicant in the main proceedings, Mr McB., who is of Irish nationality, and the defendant in those proceedings, Ms E., who is of British nationality, lived together as an unmarried couple for more than 10 years in England, Australia, Northern Ireland and, from November 2008, Ireland. On 2 November 2009 Mr McB. brought an action before the High Court of Justice of England and Wales (Family Division) (United Kingdom) seeking the return of the children to Ireland, in accordance with the provisions of the 1980 Hague Convention and Regulation No 2201/2003 On 22 December 2009 Mr McB. brought an action before the High Court (Ireland) seeking, first, a decision or a determination declaring that the removal of his three children on 25 July 2009 had been wrongful within the meaning of Article 3 of the 1980 Hague Convention and, secondly, rights of custody. ...