" The Office for Budget Responsibility indicated last year that cutting immigration to below 100,000 by 2020 would cost the government around £8.7bn a year by 2022. Theresa May, with an obsession bordering on monomania, has committed to this immigration target with a vengeance. She has not committed to saying where the money will come from.
Also, the manifesto confirms Britain will leave the single market and customs union. This will almost certainly have a significant economic cost, for the country and thus for the government. No attempt is made to calculate the impact of this on public funding. Trust Theresa, is the message. Strong and stable. Think of England.
Does it matter? Well, if you understand government finances, no - Britain's deficit obsession looks absurd, given that the original Conservative aim of eliminating the deficit has now been pushed back from the original 2015 deadline to a whole decade later. "
From this article
www.politics.co.uk/comment-analysis/2017/05/18/the-tory-manifesto-is-an-uncosted-shambles