Would/Could the NHS use £10bn efficiently?
On past and present form, that would be highly unlikely. Another layer of bureaucracy or some black hole spending on some useless IT system, with zero benefit to the genpub.
"Use the money for the NHS instead" is simply a 'Brexit' mantra to attract the dithering voters who know no better. It has as little credibility as the charlatans such as BoJo and Duncan-and-Smith who are simply hoping that a 'Leave' vote would bolster their personal political aspirations for the next government....