And I find it strange that, after my post, you still think that I have dismissed the negative economic consequences of Brexit. You are correct in that I think that Brexit was won because of the sovereignty issue but obviously red herrings did not ping back on my sonar. No pups were bought or sold as far as I am concerned. Being (temporarily) poorer was seen by me as part of the expected cost of leaving the EU.
Brexit might have been 'done right' if the process had been managed by a strong leader instead of one who basically let the EU author that hopeless withdrawal agreement. We'll never know now.
These "cumulative adverse effects" are mainly due to the rapid rise in the UK population and the associated burden on government services, especially w.r.t. health, housing, schooling and social welfare. More acute adverse effects concern the criminality (especially violent) which is an unfortunate and disturbing characteristic of certain immigrant groups. Now political and civil unrest is increasing in the UK and Europe and years of high immigration rates are the man reason for that. Migrant assimilation has not happened.
You guys always worry about the growth of the economy rather than the preservation of the nation. Infinite growth in any economy is both impossible and unsustainable, in any case.