[Reasoning]

> In addition, they were the ones that pushed heavily for a monoculture on potatoes and a few oats over a diverse agricultural landscape; which allowed the famine to get so widespread.

That doesn't mesh with what I've read. The English were generally derisive of the Irish's reliance on potatoes. But the Irish became reliant on potatoes because of the shrinking size of the average tenant farmer's allotment. Potatoes are labor intensive but produce a higher number of calories per area of land than others staple crops, especially on marginal land.

[deaddodo]

I gave the short version. Your outline of consequence and effect is correct.

The British demanded specific oats and other crops, which required large allotments; this left the Irish farmers with a small portion of land to grow their own subsistence on, in turn leading to Potatoes as the only option (ending in a monoculture). When the potatoes started dying, the Irish had no access to the other crops (as they were grown for the tenant holders).