Check the laws in Italy to make sure you can get married or register a same-sex civil partnership. Your marriage or civil partnership will be recognised in the UK if:
The person conducting your ceremony or relevant local authority can help you understand the processes you need to follow to get married or register a same-sex civil partnership, including what documents you’ll need.
If you’re a woman who has been divorced for less than 300 days contact the Italian authorities to understand whether you can get married or form a civil partnership.
You may need other documents to get married or register a same-sex civil partnership in Italy. You may also need to get some documents
legalised (certified with a stamped official certificate called an apostille) or translated into the local language by a
qualified translator. Check with the person conducting your ceremony or relevant local authority.
Marriages that take place abroad according to another country’s law are not added to UK records. Your marriage will be registered in Italy instead. The person conducting your ceremony can tell you how to get a marriage certificate. You will not be able to register at or get a certificate from a UK register office, or British embassy or consulate. Keep your marriage certificate as evidence of your marriage. You may want to get it translated, especially if you want to use it outside Italy. Find a qualified translator.
They should check what documentation they need with the person conducting your ceremony or relevant local authority and apply online themselves.
Your partner should contact their national embassy to find out what they need to get married or register a same-sex civil partnership in Italy.