Wayne sits in a reclining chair where he spends most of his days. Terminally ill, he is too weak to leave the house.

He has invited BBC News to witness his death under California’s assisted dying laws - if MPs in London vote to legalise the practice in England and Wales, it will allow some terminally ill people here to die in a similar way.

Half an hour after arriving at Wayne’s house, I watch him swallow three anti-nausea tablets, designed to minimise the risk of him vomiting the lethal medication he plans to take shortly.

When Wayne signals he is ready, the doctor mixes the meds with cherry and pineapple juice to soften the bitter taste - and he hands this pink liquid to Wayne.