More than 20 Britons are stuck on a luxury cruise ship in South Africa which is not allowed to dock due to a suspected hantavirus outbreak onboard. Almost 150 people, 19 of whom are British passengers and four British crew members, are currently on board the Dutch-flagged vessel MV Hondius which was sailing from Argentina to Cape Verde on a trip organised by tour company Oceanwide Expeditions. Three people have died and at least three others are ill, the World Health Organisation (WHO) said, as an investigation has been launched. The UN’s agency said that at least one case of hantavirus had been confirmed on Monday. A Dutch couple and a German national have been confirmed dead, while one British tourist, 69, remains in intensive care in a critical but stable condition, the tour company said in a statement. They were medically evacuated to South Africa last week.…