I'll have a play on live later on to see if it's still bad, i'll try hosting a small room of 6 people and i'll try to play with people from varying coutries to see if there's any change in network reliability.
I've spoken to a couple of friends who use BT for their xbox live service and they aren't suffering the same lag or packet issues that i'm getting which makes me wonder if it is NTL somewhere along the line or if it has anything to do with the damaged cabled i'm using.
Anyway, i'll not be back on here until this Monday so i'll test it over the weekend, and i'll test it on a different undamaged cable to see if there's any change in reliability.
Thanks goto sollp for helping me out so quickly and efficiently, if only the world had more people like you. . . . etc...
Ross