In what appears to be an extremely harsh measure, given the position of Dubai and Abu Dhabi as tourist destinations and transit hubs, the UAE has announced that no-one will be allowed to board a flight to Dubai or Abu Dhabi if they are not in possession of a coronavirus negative test result.
The rule also applies to transit passengers who are simply passing through Dubai or Abu Dhabi.
The test must be taken no earlier than 96 hours before your arrival into the UAE. It is important to remember that NHS coronavirus tests are unlikely to be accepted, since all you receive is a short text message or email which can be easily faked. You would presumably need a full certificate issued by a private laboratory. Children under 12 are exempt.
More worryingly, it appears that you will also need a coronavirus certificate in order to LEAVE the UAE for the UK and the EU. This means that you will need to break off from your holiday to visit a private clinic in the UAE in the 96 hours before you return home and pay for another test. The clinic must be on an airline-approved list.
A local media report I saw said that the exit test was only meant for UAE residents. The airports, Etihad and Emirates are insisting on a certificate from all travellers, however.