On assisted dying, are we really any good at predicting survival?

On Nov 29, the British Parliament will vote on whether

terminally ill individuals with mental capacity can ask for medical help to hasten death.

If the assisted dying Bill passes, Britian will move closer towards sanctioning state-assisted suicide, bringing it in line with countries such as Switzerland, Belgium and Canada.

There are compelling arguments on both sides of this emotive issue, and the result feels impossible to call. While public opinion broadly supports change, parliamentarians seem more divided.