Unfortunately, it just seems that there is a sort of subculture of (usually) right-wing people in the UK who are obsessed with the idea that the Met Office is plotting against them. This thread has now reached the point where the same people who were yelling that Gordon Brown was at fault for closing the airspace and it wasn't really a problem - no link or citation has yet been produced to support the idea that it was Brown's decision rather than CAA, NATS, or VAAC - are now yelling that Brown should really intervene and have it reopened rather than "hiding behind NATS".
And, apparently, a volcano going off in Iceland is Harriet Harman's fault. Frankly, you could cry.
Also, with regard to the link to The Register: when I was a tech journalist (like Andrew Orlowski) we had a saying that if it was on the BBC it was probably out of date, if it was on ZDNet it might be right, if it was in Wired it was probably right but overhyped, and if it was in the Reg there was no way of telling whether it was right, wrong, or pure pub drivel. I am not aware that the former fanzine editor has any competence to say anything at all intelligent about modelling ash dispersal, and it would vastly improve his product if he were to shut up more often.