how to get a replacement birth certificate
Not to worry.
You have a few options to get a replacement birth certificate
You can call your local registry office and order by telephone or you can do it online through your local council website.
Another option is the GRO - fill in the form and they will post you a certificate. Click here to go the GRO = they have 2 options - priority and a standard service.
For Scotland or NI search for GRO Scotland or Northern Ireland in Google.