HMRC's just released their estimates of the tax gap. What should be paid under the law of the land against what is actually paid. And as a result we've got Richard Murphy shouting that HMRC's estimations are all wet for he's the guy with the real facts.
Now I am actually under a promise to Madsen not to mention Murphy too much here but he's given us a perfect example of why the numbers differ: because the definitions do. Here's Murphy on corporation tax revenues: