Where to find after hours prices for UK stocks? Does it even exist?

Basically my title.

Does American style after hours trading exist in the UK, and if it does, where can I see the prices?

Also, what about stocks on the European exchanges? Let’s say Adidas went up 10% premarket. Where can I get this info?

Opening Auction from 7:00 AM to 8:00 AM
Closing Auction from 4:30 PM to 4:35 PM
Post Close from 4:40 PM to 5:15 PM

Good question! I’d like to know also.

I get a notification from Reuters about the movement premarket but always wonder how they know.

So where can we get see these prices before open / after close?

For example Cineworld is probably going to nose dive on Monday. Where can I see the premarket action?

Looking at futures or CFDs works well for indexes but I’m not sure it’s working for individual stocks.