According to the FT the planned publication of a post Brexit plan by the Tory European Reform Group was about much more than the mere technicalities of border arrangements:
People familiar with the 140-page draft Brexit blueprint overseen by the European Research Group said it included proposals for radical, across-the-board tax cuts to remodel Britain’s economy after leaving the EU.
So the Laffer curve driven fantasy persists.
But as they added:
But these people also said the document was of “dubious quality” and contained a number of eccentric ideas
And the plan has been dropped because they cannot agree what to say.
There would appear to be disunity everywhere. But that might, at least, save us from the tax fools. Their dream is undeliverable. I am at the point where I say thank you for small mercies.