The issue is that Labour are going to have to cellotape a manifesto together in a few weeks, so as it stands any policy announcement they make is going to be temporary and uncosted.
Fortunately for my side my understanding is that the LDs have quietly been getting on with our manifesto for the last year, for the same reason we have well over 500 PPCs when Labour have to have their NEC select them - we called for a GE last year then actually prepped in case one happened.
The manifesto drops will be the big day of these campaigns. Once the manifestos go out, we will see what the actual battle lines are, especially around Brexit.
If the Lib Dems campaign for a referendum with an option to remain and guaranteed Single Market membership, and the two big parties both campaign for 'maximum access' and no second referendum, and I am right in my speculation that Brexit will be the driving problem of this campaign, then we are facing a very big and nasty fight between three very different parties.
Expect the polls in the next few days to highlight the shift that has occurred now that we have hit GE fever.
EDIT: The Greens will not win Bristol West. We will be fighting that seat - no Green/LD agreement there.