To be honest, it's not my main router I was just playing and broke it! All a bit academic really, it would be nice to get it working again, but I doubt it'll ever be used again even if I did get it working. It's odd that DHCP is working, but not HTTP. A port scan shows all ports up to 1000 are closed.
During the week I got a 2700HGV, I downgraded the firmware to 5.29.107.19 so that I could disable the remote management & tweak the wifi power via some html. I connected it to my ADSL this afternoon, it is the fastest I've ever seen my long line go!