"Kromovaracun, the element in Thatcher's Big Bang I was talking about was banking deregulation, which allowed them to strengthen their 'casino' operations (and also allowed building societies to turn themselves into banks, as I recall). As it prompted the USA to do the same, and as it was the US housing crisis that tipped the international economy over the edge, I think Thatcher can take a lot of the blame."
This is pretty contrived and simplistic at best. I'd go so far as to say this argument starts with the assumption of Thatcher being to blame before considering anything else first - a kind of bloody-mindedness which I have to say I find exasperating. Especially the bald assertion that UK deregulation led directly to US deregulation (which, by the way, is what your argument needs to work - if that's not completely and unambiguously the case then I'm afraid your argument collapses). Please note that I don't deny influence one way or the other, I just find the summary of nearly 30 years' economic history and the emergence of a particular kind of economic model across the Western world being stamped with 'Thatcher dun it' quite galling.
"Yes, it produced a long boom - and then it produced a huge bust."
Here I have much less to disagree with - as I say, I'm not interested in party political point-scoring. I'm just trying to point that the very 'long boom' which Jake credited wholly to Labour goes back much further in time, is strongly linked to a much broader economic tendency in the West over the past few decades and, like anything of any importance (especially global), utterly transcends the movements of particular political parties in particular parts of the world. So I just find the idea that we resort instinctively to attributing praise or blame to them for this kind of thing a bit short-sighted.
[Note: I don't think they have no responsibilities - just that attributing it to them with things of this scale is inappropriate]
Hope that's all clear and I've laid out what I'm saying reasonably well :).