As it says, Audi are recalling approx 5,000 a8 v8 diesels built between 2013-2017 for an emissions recall/update to the computer software. This will commence early 2018. Here's the link for further info:
http://www.autoexpress.co.uk/volkswagen/92893/vw-emissions-scandal-recalls-compensation-is-your-car-affected-latest-news
Also please check out other info regarding emissions recalls under the recalls section so that you can make an informed decision on whether or not to have the recall done. As with all other emissions recalls this will NOT be compulsory and you can opt out of it. This also will not affect your tax of your vehicle.
Cheers
Steve