Geoff Tily is the chief economist of the TUC. We've known each other for some time, and like all good economists have the odd difference of opinion when sharing a pot of tea, or something stronger, but in our case the differences are located between vastly more common ground.
Geoff has written a really useful blog under the above heading on the TUC Touchstone blog. I strongly recommend giving it a read, especially for the more technically minded.
I'd even suggest reading the IEA blog he links to. Julian Jessop at the IEA is typically IEA in many ways, but at least he can explain why, even if he is wrong. His ability to explain is enough to make it worth learning from his mistakes.