The link is to a report by the House of Lords European Committee on the Prum Treaty,which is mainly concerned with the exchange of data across borders to combat terrorism illegal immigration and crime. The signatories are Benelux, Germany, Austria, Spain and France. I picked up its existence in a piece in Private Eye [21st December to 11th January] , the British satirical magazine, which alleges that the UK is signing up to a parallel treaty that doesnt include “hot pursuit” across borders.
I’m quite surprised to have missed this Treaty, but will be following it up!