lag on UK1, 2 and 5

Hey there

Lately (since UK5 is online) my ping is much higher than normally.
But strangely this only happens on UK1,2 and 5. On UK3 and 4 nothing has changed.
I live in Switzerland, so my normal ping is about 35. But now, it's exactly 200 more:

http://img196.imageshack.us/i/uk1.png/
http://img535.imageshack.us/i/uk20.png/
http://img225.imageshack.us/i/uk3.png/
http://img517.imageshack.us/i/uk4.png/
http://img690.imageshack.us/i/uk5.png/

Actually, this isn't such a big problem sice I still can play on UK3/4.
But I'm just curious why this happens and if im the only one who has this problem.

Pls excuse my not perfect english.

Yours faithfully
Onuris