Grimnir is back up and running, EasySpeedy's DNS is still knackered. I will be investing in DynDns's recursive dns service (as primary!) once I'm paid.
I've had to bypass my problem by, erm, running my own dns service on Baby Jesus. I've managed to block any outside recursive requests to those only of Grimnir. However, if Telewest find out they'll probably go ape shit. Thankfully TEMPORARY is the word.
Also I never realised how dns intensive Grimnir was. Theres a look up for everything every second!