We returned home on the Cap from Bilbao last Thursday (25th), departing as scheduled. About six hours later everything went quiet and we were informed there was "a serious medical emergency". Presumably a helicopter came from the nearest French base to winch-down a doctor/medic. It was four hours before the helicopter came back to collect them and we got underway again. Docked in Portsmouth 19.00.
PS - a pity the Cap does not have a heli-pad - we had a similar delay last June when returning from Bilbao, only that time the medical emergency took place in the western Channel closer to the French coast, so helicopter transit times were shorter.