$1 million is, as of the 7th June, is worth exactly £594849. So after I’ve exchanged it, I’ve barely got £600,000 (how I’d exchange it is a different problem, how much advance notice dyou think you’d need if you wanted it in cash?).
However, if we’re thinking realistically here, I’d probably blow it on something stupid. Like chocolate bars. And because Dairy Milk bars cost 50p each, I’d buy myself 1189698 chocolate bars..which would probably last me like a month. If that.