Re: Obvious, really
I upvoted, but then I immediately realised that the OBR is, after all, a government department so would face pressure to not be as generous with other parties as it would be with the government. But I'm unsure as to how it could be done in a different way.
Then there are also the actual manifesto promises themselves - are they politically feasible or is it just made-up shit? The Electoral Commission, for instance, should have had the power to block the referendum until there was a credible contingency plan from the government and a credible exit plan from Leave.