Hi Fraser, I previously achieved my full 55Mb over wired FTTC (this is a new FTTP line). Wireless was typically in the 40s, but 2.4GHz is quite congested here and the R1's never had the best range. I run my consoles wired so that was never a problem.
Tried another PC today and several cables in all ports, but no joy. I think I'll just get a new router, but it's a curious thing. I downgraded to 1.03.6j and then reflashed 3.0.207. It seems like a traffic-shaping bug so I reenabled QoS and set my laptop to 100% (with dedicated IP). I'm seeing 1Gb in and out on the table and my full speed under connection benchmark, but the speeds I'm getting are consistently 1/6th max.