The GRO in England has made some changes to their fee's and services. Due to an increase in current demand for Certificate's present orders will be subject to a five day additional dispatch time. The GRO have also reviewed their range of service's. They have now withdrawn their reference checking service. The cost of the certificates will increase from 7 pounds to 9.25 pounds. This means that you will have to know the references for your certificates. You can find the references when you find the record on the site Free BMD.
This is the web site for the GRO, where you can order your certificates