Therein lies the problem - we don't manufacture anything from raw materials with which we can trade. Just walk into any shop (and we are a nation of shopkeepers!) and look at where most of the goods are manufactured.
The concept of the UK making it's money via becoming a global financial services centre was always high risk and IMO doomed to failure, as is demonstrably the case. Add on the cheap foreign labour costs (especially sweatshops abroad, in countries that will have learned the lesson by observing capitalist states) then the picture becomes even more bleak.
Finally, sign on to expensive policies which involves importing even more skills and goods.....