Three products, and most people need only one. All of them are covered by the same promise: accepted where you send it, or your money back.
Legal proof of your new name, prepared with your details and posted for you to sign.
The same document for a child, with clear guidance on who has to consent and sign.
Every form and notification letter for the organisations that need to know, already filled in with your details, in the order to send them.
Taking your husband's or wife's surname? Your marriage certificate is your proof. Going back to your maiden name after a divorce? Your decree absolute normally does it. In both cases the only thing you might want from us is the Name Change Kit, for the telling-everybody part.
Accepted where you send it, or your money back.