You will have to wait and see if your child actually winds up looking like David Beckham as ordered, but, across the pond, there is this now:

The changes to the Registration of Births and Deaths Regulations 1987 were approved by Registrar General James Hall earlier this year, following Royal Assent for new parenthood provisions contained in the Human Fertilisation and Embryology Act 2008.
A spokeswoman for the Home Office said that there will be provision for a birth certificate to be used that will have two “parent” sections, rather than mother and father.
Also, sperm donors will continue to be able to opt in or out of having their name on the birth certificate, but if both mothers wish to have their name on the document, the donor cannot be registered in that way.