Autism Bill

My hon. Friend is speaking authoritatively, as always, on this subject. She referred to the disappointment at the fact that the prevalence study had not yet taken place. So that we understand and so that those listening outside the House to this debate know of the reason for the scale of the disappointment, will she be good enough to point out how long ago that ten-minute Bill was introduced, and therefore when the commitment to carry out the study was made?