Human Fertilisation and Embryology (Mitochondrial Donation) Regulations 2015

The noble Baroness made the point that heteroplasmy, and therefore the carryover of the diseased mitochondria, is possible under this technique. Does she agree that experiments show that the likelihood is less than 5%, whereas pre-implantation genetic diagnosis has it at up to 40%? That is a legal procedure, so we are talking about trying to legalise a safer procedure than something that is currently legal.