It's not a new deal, but thought it was worth reminding people as I've just saved £720!!
All you need to do is download the Aviva Drive App and drive like miss daisy for 200 miles, depending on your score you can get a whopping 28% discount off your policy which stays for as long as you renew with Aviva.
I just drove 200 miles on the motorway when I had a trip planned, which is an easy way to get a top score (I got 9.5 out of 10).
You can also add another 20% discount on top by purchasing an annual travel policy, the cheapest is around £20, which is well worth it for the discount even if you don't need it.
Hope this helps some people