http://www.legislation.gov.uk/id/ukdsi/2011/797

2.

This Order shall come into force on the date upon which the treaty specified in the Schedule enters into force for the United Kingdom2.

It will be possible to find out the date on which the treaty specified in the Schedule enters into force for the United Kingdom by referring to the relevant page on UK Treaties Online which is part of the Foreign & Commonwealth Office’s public website. The link to that page is: http://www.fco.gov.uk/en/treaties/treaties-landing/records/14400/14429