Dane

Thank you for the response 
 
1: I think Fortnite don’t use London servers that much , I do not know how it works but I do know energy prices are crazy in the UK so would make sense if cheaper to run at the moment in other places than London hence why a lot of people get diverted to Frankfurt or Paris not just on Fortnite . 
 
2: you are right it does not work being party leader playing Fortnite , my only solution that is the other person needs GF also. 
 
3: I will do just that . 
 
thank you very much 
i have been playing with no GF on today as it is a bit tiring ping watching and waiting to get into a game but I will definitely be playing about with GF sometime this week and will report back with what I’ve encountered hopefully not much . 
 
thank you again 

Yes unfortunately due to the way they have their matchmaking setup it can take a long time to get kicked back to the lobby when it blocks a server. You may find it more efficient to disable filtering for the device but still have it added to the Geo-Filter so you can see what server it puts you on and quit to the lobby then research for a game, it may be faster. Another symptom of their matchmaking system, being the party leader should resolve it (it does in other games) but may not help here Add the chat server to your allow list and then you can keep your radius over the servers you want to play while still able to chat to them

Possibly, we would have done some updates since then, perhaps it did resolve it for them

No worries at all, that should be all for now, thanks for your help!

Just to clarify, what is the 6ms ping to exactly? What is the 'normal' ping you're getting to the London server without the Geo-Filter enabled? Are you confirming you are actually getting the London server in that scenario with the Geo-Filter just with filtering disabled? 
Have you enabled Game Mode/activated boost? Have you done the ping optimizer feature?

The ping you see on Ping Optimiser is the ping you're receiving from the test server it's using, connecting to other servers, e.g. game servers won't necessarily mean you get a ping that low. 
Thanks for the screenshot of the server, so now this makes sense, that server is actually in Germany so it is mislocated on the map. We'll correct it. If you could:
Copy/paste any server IDs you get when just covering the UK that get a higher ping like that  Copy/paste any servers IDs you get when covering Europe that have a lower ping like you would expect being connected to a UK server Then we can correct them all to prevent it happening. In the meantime you can block any of the higher ping servers you see and allow any of the lower ping servers you see and it will start to improve.