AWR... your profile doesn't say much about you but I'm assuming you are not an aviation professional and may not be familiar with such events. Diversions for medical emergencies are not uncommon and it would obviously be preferable to pop into somewhere in the UK rather than spend hours over the Atlantic with a sick passenger.
ATC and the airlines go to great lengths to assist in such cases. One could argue that launching a lifeboat to rescue a kid on a surfboard is a huge waste of resources but it's good to know that for some organisations human life is still valuable.