This talk will consider the changes which have taken place in recent years in attitudes towards questions of public international law and of foreign affairs when they arise in the context of domestic litigation. David Lloyd Jones, Lord Lloyd-Jones, became a Justice of The Supreme Court of the United Kingdom in October 2017. Lord Lloyd-Jones was born and brought up in Pontypridd, Glamorgan. He attended Pontypridd Boys' Grammar School and Downing College, Cambridge of which he was a Fellow from 1975 to 1991. At the Bar his practice included international law, EU law and public law. He was amicus curiae (independent advisor to the court) in the Pinochet litigation before the House of Lords. Lord Lloyd-Jones was appointed to the High Court in 2005. From 2008 to 2011 he served as a Presiding Judge on the Wales Circuit and Chair of the Lord Chancellor's Standing Committee on the Welsh Language. In 2012 he was appointed a Lord Justice of Appeal and from 2012 to 2015 he was Chairman of the Law Commission. Lord Lloyd-Jones is the first Justice of the Supreme Court to come from Wales.