Can a birth certificate be certified a true copy?

If your birth certificate was issued in the UK legally it cannot be photocopied as it is subject to crown copyright.
What is an apostille?

You will know your document needs to be apostilled if your foreign lawyer or official has asked you to provide a UK document and they have said it must be apostilled or legalised.
When would I need to use a notary?

A notary public is a specialised lawyer appointed and regulated by the Faculty Office of the Archbishop of Canterbury to verify facts, witness deeds, and authenticate documents for use in legal jurisdictions outside of England and Wales