Preimplantation genetic diagnosis (PGD) was first carried out at the Hammersmith Hospital in London by Robert Winston and Alan Handyside, who developed a way of determining the sex of the human embryo before implantation, thereby reducing the risk of X linked disease. PGD is yet another example of a technological advance that originated in the UK but because of lack of resources and investment has been extensively taken up and developed elsewhere in Europe and particularly in the USA. As the authors of …