I suspect that the JV partners will still be running the numbers...

I suspect that the JV partners will still be running the numbers on various scenarios. There is no doubt that rescheduling the drilling program to back load the cost (that than drill 3 simultaneous wells) would save considerable amounts, and IF HHR win any future licenses close to P2607, then the gas in these could potentially expand the reserve base to a level where the NPV is materially improved.
We still don’t have any clarity on the route to market which I assume is because Shell still haven’t decided who to sell their assets to. That may also be a determining factor in costs, or whether an alternative route is more cost effective.
The effect of Labours proposals is to materially increase the net capex on a development. The only way to counter that is to reduce capex and/or extend the potential life of the project with more gas reserves.