A Certified Copy is a recognised duplicate or your original Deed Poll, which will enable you to send multiple copies of your Deed Poll to the relevant organisations at one time. It can take several weeks to receive your original Deed Poll back from organisations, therefore updating your records can take longer. Organisations will not accept photocopies. We recommend an additional 5 - 10 copies, so that you can update people like the Passport Office, DVLA, Banks, Mortgage Providers, TV Licensing, Employers etc.
Having a document legalised means that the U.K. government will confirm that the signature, seal, or stamp on the document is genuine — so that it can be used in another country. It does not guarantee that the contents are genuine, or that the document is legally valid.
For a U.K. document (such as a deed poll or statutory declaration), it’ll first have to be certified by the Legalisation Office of the FCO (in the U.K.). Thereafter, it depends on which country you need to use your document.