Should Labour say Brexit a Mistake?

Laughable rubbish. You cite as evidence for the abandonment of thatcherite policies under Major a fall in unemployment to 1982 levels, which is hardly impressive and is in fact anyway an outcome not a policy. That's all you have. No one but an idiot would try to argue that Major reversed thatcherite economic policies. Which ones?

And which ones did New Labour reverse? Yes they might have splashed a bit more money around but they did almost nothing to change the basic economic status quo. The broad tenets of the thatcherite consensus are with us still and have become accepted as integral by the establishment. You yourself are too stupid to see that you yourself have bought into it and are a part of it.

As for "affordable" housing, that word is very elastic and open to question, and is often used by types like you as propaganda. Fact is your chosen lot were such solid thatcherites that they built less social housing than Thatcher herself, and shared in the obsession with home ownership as the only thing that mattered, and you continued selling off whatever social housing was left.

So you can take your bullshit propaganda and put it where it might have some hope of fooling people. Might I suggest Private Eye, where at least you might serve the useful purpose of providing nonsense for us to laugh at.

You started by posting that Thatcherism was still in control, your posts are a joke added to by exposing your ignorance of the Thatcher things she did that were resolved by NL. Now instead of professing to know what happened come back when you have sorted head out. 

Says the idiot who thinks thatcherism ended in 1990 yet cannot give specific examples of how. Almost everyone accepts the reality that a thatcherite consensus has become established which both New Labour as well as the Tories have bought into. Only you are too stupid to see that. 

OK Mr. Big mouth small Brain posts, how about you posting some verifiable facts about your claim? Let's see just how much water they can hold.

Here are some facts about Thatcher's mess that NL sorted out. 

Unemployment peaked at 4million under Thatcher, NL took Unemployment to its lowest since 1980.
You have previously acknowledged that NL rescued a NHS that was severely damaged by Thatcher.
NL ended the 'Boom and Bust' method, used by Thatcher to control the UK internal economy, accomplished by handing control of inflation to the Bank of England. Still used today.
NL ended Thatcher's madness of Grant Maintained Education that saw most state schools starved of funds. 
NL introduced the Minimum Wage that increased the earnings of many people.
Thatcher added over a million children to the count of children living in relative poverty, NL were on the way to relieving that by 1million before the 2008 economic meltdown (IFM). Even after the meltdown there were still fewer children living in relative poverty than in 1997.

In terms of its advantages versus disadvantages, if the goal is economic prosperity greater than it would have been inside, then it is clearly an utter failure so far.

That was always the goal for most people I know. They tried the arguments from all ways. People did not vote to be poorer etc. It was always subject to the actions of Parliament. Cameron said he would enact what we decided then ran away, leaving a somewhat chaotic situation behind. The point being that we could gain back a level of control but it seems now that International law is being used now to bring us into line and migrants are being directed and bussed to the beaches and being ignored by the Gendarmerie. Controlling it would be so easy if only we were in the EU. It is not paranoid to suggest they are out to get us, the people, and our government is complicit.