The FT have done a breakdown of some elements of that report:
https://next.ft.com/content/a3ae78d8...1-0fb5e65703ce
They're saying that it's higher than most projections because of how they've done it but that almost all models say we'll lose out:
Quote:
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While almost every economic model has suggested Brexit will hit economic performance and productivity, the government’s estimate is higher than those published by the CBI employers’ organisation, Oxford Economics and Open Europe. The main reason for this appears to be the dynamic modelling strategy which is broader, but less certain than models which give smaller results.
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Although they also state that their projections aren't too dissimilar to that of the LSE.
The thing here is that as well as the government you also have organisations like the LSE, the CBI, the Bank of England, the IMF and major companies saying that the UK will be hit economically by Brexit. Two of the most economically literate publications in the country, the Economist and the FT, seem to be pretty much backing Remain too. Vote Leave's reaction to that is that they're all wrong, scaremongering and that we will get better trade deals. Yet they seem to have very little backing from economists, institutions and companies.