Crippling speed

[#1]

Strange - I got into the stats again expecting to see the rogue DNS servers and there's nothing in the DNS fields!

[#2]

Do we know the Plusnet ones that I could enter manually?

[#3]

Pick any two from these:
212.159.13.49
212.159.13.50
212.159.6.9
212.159.6.10
It would also be worth checking to see if you have DNS specified in your router (Airport Extreme) or in your computer(s).