Completely changing code for change finding.
Added variable to hold change due.
Added code to find multiples of note/coin in change due.
Added code to find £50 multiples in change.
I tested the code and it seems to work. Now I have to add code to find how many other bits of change are required.
Code works for most change scenarios.
But it doesn't work if cost is 2p and you pay 3p: it says no change is due. Can't figure out why?!