I did have a hilarious issue for a while where it didn't know about either of the Severn River crossings into Wales (and yeah I didn't have it set to avoid toll roads). Not only did it not know about the "new" bridge, which is something like 20 years old, it didn't even know about the "old" bridge :D
The sodding thing used to try to take me via Gloucester (+2 hours to the trip) and didn't have any idea what was going on when I was on the bridge it didn't believe in.
Thankfully this is now fixed!
My setup is to punch in my destination and let Google audibly give directions, and then open Waze for hazard/police notifications.
Edit: Ok, this is wrong, sorry. I searched for "Waze UK" on google and the first result just takes me to the US site.