Ping spiking, Please read.

Ok, so i my ISP is orange and i'm currently on the best package possible, two of my other freinds also have the same ISP and package.
My problem: Around 6-9PM GMT, i spike hardcore from 140-700 ping every second or so, although my freinds get a stable 130-140 ping at all times of the day.
Any suggestions if it's my setup or my ISP's problem?
Thanks

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