Charles Moore writes about the purpose of think-tanks. This is the passage that really struck me:
Very few people are any good at policies. There are people who are good at ideas, and there are people who are good at administration, but you need to translate the ideas into forms that can be implemented.
This is certainly my experience. It’s easy to sit round a table at a meeting, swapping great new ideas about how things should be, but it’s much harder to work out how those ideas can make a real impact on the practical planning that needs to be done. Or the admin crowds out the possibility of new ideas emerging, and as a new project starts, or a new year approaches, we simply copy and paste the various templates we have on file from our previous work because ‘everything seemed to go OK last time…’

I coulnd't find a picture of a think-tank, so here are some classic Manhattan rooftop water tanks instead
Here is the main passage about think-tanks:
Do think-tanks make any difference to anything? I ask because I stepped down this week after six years as chairman of the centre-right think-tank Policy Exchange. In a moving ceremony in the garden of Nick Clegg’s old school (Westminster), David Cameron marked the handing over of the reins from myself to the brilliant and witty Daniel Finkelstein of the Times. He spoke about the importance of the battle of ideas.
He is right. Many of the nicest English people deplore ideology in politics, but the problem is that, if nice people have no ideology, others do not follow their example. Nasty ideology has the field to itself. This is very marked in the sphere of Islamism, in which Policy Exchange does excellent work. One reason that extremists can, almost literally, get away with murder, is that moderates do not have the facts and the contacts with officialdom to counter.
Another value of think-tanks is that very few people are any good at policies. There are people who are good at ideas, and there are people who are good at administration, but you need to translate the ideas into forms that can be implemented. For instance, you encourage the idea of ‘free schools’, but, in order for them not to have perverse effects, you need to give them an incentive to include pupils from poor or bad backgrounds in their number. In this spirit, Policy Exchange invented the ‘pupil premium’.
The knack is to be practical while at the same time being faithful to the original idea. Only think-tanks seem to manage this. They are tiny, but they matter. The few, not the many!
I think I’ll start a think-tank. Great idea! But then I think of the administrative energy required to get one going, and my mind drifts off to another earth-shattering idea…