Andrea Minichiello Williams, founder and director of Christian Concern For Our Nation said the Bill was timely in view of the current debate about embryonic stem cell research and so-called "saviour siblings", just two of the provisions in the Human Fertilisation and Embryology (HFE) Bill currently making its way through Parliament. The creation of saviour siblings to help treat a sick brother or sister is controversial because it involves the selection of a designer embryo, whilst others that do not match are destroyed.

"Allowing for this in our law, even with restrictions, opens the way for designer babies," she said. "Furthermore, throughout the passage of the HFE Bill there has been little discussion regarding the rights of 'saviour' children and in particular, how they will feel about having to donate their tissue and the kind of pressure they will feel under as they grow older."

CCFON and other pro-life groups are urging their supporters to contact MPs to voice their opposition to the wide ranging provisions within the Bill, which will reach its final report and third reading stage in the House of Commons on October 22.

David Burrowes, who was a member of the Joint Committee originally scrutinising the draft HFEA Bill said: "We heard surprisingly little about stem cell therapy other than embryo and inter-species research. Given the ethical, political, and biological constraints of embryonic stem cell therapies we will for the foreseeable future depend on the development of other stem cell therapies like cord blood. When cord blood stem cells have been successfully used to treat 85 diseases and have the potential to treat more, we should do much more to support donation, collection, treatment and research."

Colin McGuckin, Professor of Regenerative Medicine, University of Newcastle upon Tyne added: "Cord blood has already cured around 10,000 people, but despite this much of the UK stem cell funding goes towards other types of stem cells including embryonic stem cells, which are not expected to cure people in the next 50 years. Value for public money demands that this is addressed and patients get what they need."

CCFON said the development of cord blood banks would remove the need for the creation of saviour siblings.

The Anthony Nolan Trust opened the UK 's first combined public cord blood bank and research centre last month, and plans to have 50,000 cord bloods in storage by 2013, with 20,000 suitable for life-saving transplantations, and 30,000 for research.