I honestly don't know, but I suspect that unless we stop thinking of economic growth as being a main policy objective and find a way to make a swift decline in our economic activity palatable, and deliver it, as a species, we're ****ing stuffed.
The exchequer can come up with plenty of sticks to make that happen (50% VAT, anyone?), but the carrots have defeated the best minds of our generation.
Aspiring to fund and deliver an electrified freight distribution network that takes everything within the last mile of the point of consumption and is completely prioritised over personal journeys would be a bloody good start, though. And funding a massive expansion in renewables to power it.
I'd also throw money at taxation enforcement and collection and get rid of non Dom status, as that would be easy extra bucks.
I would not throw another single public penny at expanding or subsidising powered personal transportation, be it rail or road or air, as that, perversely, is a very good way of getting us exactly nowhere.