You have a very good knowledge of everything that happened. Your answer would end up being chronological. But, you seem to be in control of that, so you have split up the different eras and made comments about economics, changes, developments etc. I have the mark scheme for the question. it says you need to show a balance of loss and gain for the economic, and you can go about it regionally or...
It says to start the essay,you should outline Pitts promises nd hopes for the unions:
-trade an manufaturing
-agriculture
-prospeity
-flow of capital
so it says you can use these as themes
Or, it seems to say that you can use the famine as a turning point and discuss circumstances before and after, perhaps splitting the circumstances into themes which i have wrote above.
But you see, I got that from an examiners mark scheme, so wouldnt have known that off the top of my head. You plan seems good, my only advice would be to try and add a structure now, so that it has a flow and a stead argument of gains and losses. I hope thats of some help!