Hannah Devlin: There are already a group of scientists who have been working on this, I think informally since last year. They want to come up with guidelines that they hope the whole community in the UK and possibly beyond will form a consensus around. She says it's an incredibly technical area where you want the laws to be clear, but also to allow them to take into account future advances. Hannah: These models do prompt bigger, more philosophical questions in terms of what makes humans humans.