Pete, you need to do better than just discredit the IMF because their forecast does not match your expectations of economic performance.
The Ftse 100 index has risen by less than 10% since Brexit and this is purely a reflection of the fact that approximately 77% of FTSE 100 company revenues are generated outside the UK and therefore inflated due to the fallING pound.
We can't enter trade negotiations in any meaningful way until we know the terms we leave the EU on, and as existing members cannot act unilaterally.
We're heading for a stalling economy with higher import prices giving inflation a nudge up also.
It's a shambles - politically and economically.
The IMF have consistently called things incorrectly. They lambasted the Uk for it's 'austerity' measures then had to agree it was the right thing to do, they consistently have a bias towards the Eurozone as described by their own internal reports, and fudge their projections.
So you agree that the £ and the FTSE are working hand in hand and not just both falling, unlike the doom laden projections from before.
Trade negotiations cannot be concluded until after we exit, but that is not the same as being unable to get them set up. We will then have a deal with the Eu and a flying start to further deals after the two years.
In your mind it is a shambles, because it's not what you wanted. You have been unable to admit that there is even one possible positive economic attribute in our exiting the EU, which I find surprising. Any change brings forward opportunities.