I think its so important people see this study based on the governments own analysis. Also reflects similar studies (one carried out by a free market US think tank I remember).
"After looking at all four options available to the prime minister, the study established that in the long-term, the amount of money available for spending on public services would fall. Under the so-called Norway option, there would be £262m less a week, under the Canada model it would be £877m, while under a no deal it would be £1.25bn.
This would mean 22% less funding available for the NHS if there was a bespoke deal, and 9%, 31% and 44% less under each of the other options."
www.theguardian.com/politics/2018/apr/18/each-brexit-scenario-will-leave-britain-worse-off-study-finds