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I think the Conservatives are playing a waiting game, seeing what Labour do, and how the 'progressive alliance' (or various local agreements) evolves.
It's the Tories' election to lose, so they don't need to make the first move, and can instead selectively shoot down attempts by others to take the initiative. Once Labour and Lib Dem etc. make their positions clear, the onslaught from the Lynton Crosby machine will doubtless ramp up.
I suppose the other interesting aspect is that this election is not a traditional 'party' election as the importance of the Brexit issue is so strong. That would suggest fighting the election on pure party ideology might not be so effective. For example, I'm feeling relatively indifferent to party allegiance, and, in theory, would be interested in voting for someone who can make a difference on Brexit. I don't care as much as I might ordinarily do about who gets my vote. Well, as long as it's not the Tories.
Most of the reading I'm doing on the election is from the top few articles on BBC and I'm surprised at how well the Labour messages are actually coming across. Conservatives on the other hand, repetitive and vague. Maybe my judgement is clouded but I'm daring to hope it won't be apocalyptic.