30m? Stones must be at least 70/80m in today's market, even with his injury record. Back-to-back champion, with multiple cup trophies to his name too, english (premium), entering his prime years, and must have at least 3 years left on contract.
Not that i think there is any truth whatsoever, but if we are talking hypotheticals, let at least the figures be sensible.
£70m-£80m for John Stones isn't sensible to anyone other than City. Maybe I'm undervaluing him a tad but absolutely no chance he would go for anywhere near those figures.