Why don't you read the book again? Dellingpole never once denies that climate change doesn't happen or hasn't happened. That would be like denying the existence of snow. The climate always changes. Whether is it caused by human actives is the issue.
You say "I suppose consistency is not a requirement if all you're interested in is exposing a supposed plot to justify more state controls over the pursuit of individual freedom."
Consistency is clearly not a requirement if you seek to to justify more State controls over the pursuit of individual freedom, as the IPCC have shown time and time again. Dellingpole isn't 'making this up' he directly quotes from IPCC reports that have been mangled, distorted and twisted to suit their agenda and keep their jobs and their multi million dollar funding packages alive. If you did read the book, re-read the chapter on Ben Santer and the IPCC report. See how in the 'summary for policy makers' section, Santer completely turns the whole report on it's head. It's shocking. This was one of the key moments for the whole AGW movement. If you were in any doubt about their motives take a look at green-agenda.com. These are the people who run the AGW show.
If you didn't already know, CO2 makes up 0.04% of our atmosphere. 97% of that CO2 is naturally occurring, 3% is man made. Do we really believe that 0.0012% of a gas that is fundamentally plant food is going to cause catastrophic climate change that will wipe us all out and transform our planet back to a smouldering rock?? What about the 97% natural CO2 (still only 0.0388%)? Is that somehow more benevolent and peace loving and has therefore left us alone for the last hundred years? See this is the problem.
There is so little causal link between increased CO2 and temperature change. This is also currently being born out through reality. There has been no significant increase in temperature since 1998 despite CO2 levels rising. And this is accepted across the board.
There are so many more urgent issues to address in the world and torching trillions a year on a hunch that has rapidly proved bogus is utterly criminal. And this is the bedrock of Dellingpole's book. If you are as you say, genuinely interested in what climate realists have to say, check out these sites and as the venerable Chuck D once said, "Don't believe the hype".