To comment on the public sector salaries and going back into the economy. That's true but it's an ever decreasing circle of money. As it flies out the country on imports, holidays etc.
So it does, but then so does private sector employee's pay. And, of course, many of our utilities and manufacturing companies are owned or part owned by foreign companies so off their profits (made with our money) go abroad.
I completely agree that our economy needs re-balancing; we need to be producing and exporting more; we need, at the very least, to be taxing profits made by multi-national companies (like Amazon, Google etc) in this country (funnily enough, an EU directive aiming to do this comes into force in March 1919, just when we might be leaving the EU), we should be encouraging investment in industry and we should be investing in the infrastructure needed to attract businesses to all parts of the UK, not just London (like dualling the A1 from Newcastle to Edinburgh...).
I do appreciate that we need all that, but in the meantime, spending on the public sector is helping to keep the economy afloat and the last thing we should be doing is cutting back on it. There seems to be little point in cutting back as the money 'saved' isn't going to be invested elsewhere, is it?