However what will anger rather than merely disappoint is if the answer to the spirit and the letter of the question on the referendum paper is not respected
Nobody is arguing over the letter.
But there is huge disagreement over what the "spirit" means!
It is not practically possible to deliver what you argue is the "spirit": "[not] remaining subject to the rules of the EU over our own regulations" whilst maintaining our prosperity. Hence the current white paper, which explicitly commits us to following the EU rulebook. Note that any final deal will involve further concessions beyond this.
Others regard the "spirit" in entirely different, and self-contradictory ways.
All practical options involve betrayal of the spirit of what leave voters believe they voted for. It was always going to end thus. The leave campaign presented a fantasy.