Changes made by Marriage (Same Sex Couples) Act 2013 (Consequential Provisions) 2014
S.I. 2014/107
Made to Registration of Marriages (Welsh Language) 1999
18 changes. All changes made by Marriage (Same Sex Couples) Act 2013 (Consequential Provisions) 2014
From legislation.gov.uk's record of changes, the official one: see it there.