The Big Certificate Rip-off

The Identity & Passport Service has warned: don't pay too much for your replacement birth certificates. See their advice here

This applies equally to other certificates.

When using commercial websites to find an index entry for a birth, marriage or death registration it can be tempting to click on a conveniently placed link to order a certificate. However it will almost certainly be cheaper(or at least the same) to go the official government site to order