I've tried changing filter (not got a spare RJ-11 cable right now though), I did get some net yesterday then lost it again, I just got off the phone to o2, he was limited in what he could do due to me not using an o2 Box though as i expected, he reconfigured the ports at their end, he tried to order me a power cable for my old box which was nice but to no avail, of course right as I got off the phone to him the internet came back...:/
Think I might try and give Netgear a call
Edit - It would also be great to hear from anyone who is running the same router with o2.