I agree with the basic point (that little difference could have been made once the credit crunch got rolling) but I'd argue this bit. Conservatives are by their nature conservative. Kind of goes with the territory

. IMO I don't think a tory government would have put through some of the deregulation that Labour did, or at least they'd have kept much more of it 'in house' as it were. In the end it wouldn't have changed the fact the banks were basing vast profits and economic forecasts on money that didn't actually exist but it's possible the high street banks would have been forced to be somewhat less cavalier. The state would still have had to bail them out but not by as much. However whether 'only' bailing the banks out for say £120 billion rather than £180 billion would have made any difference in the long run is a purely academic question.
Jon