Yes, but imagine what the company Tony works for would do.
They export I believe? What impact would it have on their competitiveness abroad?
Would they invest in more automation and release people?
When they hired people, would they take a risk on a school leaver, or would they rather bring in experienced and skilled people from outside the UK?
What would happen with inflation? How would that impact the unemployed, who might now find it even more difficult to find work?
I'm not against a minimum wage per se, although I prefer a free market which can find its own level. I prefer lots of competition in the jobs market so that wages find the correct level for the economy.
My point is, if one can imagine the economic consequences of a crazy number like £50 per hour, and one accepts that there isn't a magic number at which suddenly these consequences ignite (it happens gradually - a small move in minimum wage causes a small change in the economy), then one can understand that there could be negative impacts from a rise of some 50%+ to £10.