Mr Lidington says he will vote against the creation of hybrid embryos, which are mixes of animal and human tissue.

Scientists say they would help tackle diseases such as Parkinsons, but critics argue that such 'Frankenstein' practices tamper with nature.

The debate in parliament began at 3.30pm, with a vote due at about 6.30pm.

Mr Lidington says he is not 'absolutely certain' which way he will vote in tonight's debate on 'saviour siblings'- babies born from embryos selected because they are a match for a sick older brother or sister with a genetic condition.

Opponents argue that children will be created purely to help their siblings, and not because they are wanted.

In what is a busy two days in The Commons, tomorrow Mr Lidington will vote in support of the role of fathers in fertility treatment.

He is against a bill which would end the requirement for IVF clinics to consider the role of the father in a child's welfare, which would enable single women and lesbians to get treatment.

Finally, Mr Lidington will vote for the upper limit for abortions to be brought down from 24 weeks to 20 weeks.

Due to the moral nature of the issues being debated, MPs have been given a free vote.

What are your views on the issues being debated? Do you agree with Mr Lidington's stance?

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