What makes you think you can rule the game out?
What you need is a location and hardware that works correctly it is no good testing bad with bad as all that will tell you is they are both bad.
Or are you saying friends system at his house is fine and no lag?
no my friend also has this problem.
the trouble is i have thought about how many people i know who use online gaming, friends, family, friends who are on my xbox friends list and im yet to find a single person who doesnt have this problem. close friends and family - there are about 14 people i have asked and we all share the problem. do we all have faulty consoles, discs, routers, controllers? all i can do is test different setups to that i already have. im certainly not saying all the people in the UK have the problem but everyone i know does. is it a location problem? this is something that has always puzzled me because we all share the same problem but use entirely different setups. there is no common ground between us.
i have tried testing each step as you suggested forgetting all the other people i know have the problem, working solely on my setup. but no matter what i try i cant get any change.
something which ive been reading about last couple days is that of port traffic. when i do a speedtest or a ping test they always show up great results at all times of day and night. but im now aware that these testers use different ports to that of the online games i use. different games use different ports and all are different to that of the testers so basically i can do as many as these tests as i want but it wont show up the problem, if there is a problem with traffic congestion on the ports i need most.
anyway thats a conundrum for another day if i get that far.