Ping problem with UK servers

My original ping is about 70 but for some reason I get either 180 or 240 ping when I join a game and its stable, I have to keep rejoining several times to actually get back to 70 ping and im fed up of rejoining... cant even play clan wars now.

On the cf website forums they say its not a problem with my internet or PC but if it wasn't then it everyone would have the problem and not just me... so im wondering if anyone knows how to fix this? Its been going on for about a month, i doubt there is but I hope anyone knows a way ?