I got weeks with lag and then without lag on and off at this server.
I made this thread about it. Sometimes is randomly gots laggy (all games) and at some point, the lag is gone again for days/weeks. And after some time it is just back again.
At the same time everything else is just running fine at my end, so i do think it has something to do with the UK server (most of my games are on that server too).