They fancy sheep in Yorkshire. Only they call them "lasses" ("Hurry up, tha' doesn't want to gerroff with n'ugly 'un").
(I'm a Lancastrian, without even a trace element of "Hooray Henry"

).
Yes, if the English were taught their history properly, they'd realise that their biggest enemy wasn't the Scots, Welsh, Irish or French, but their own ruling classes. Our Celtic cousins are perhaps fortunate that they can blame their woes on the English ruling classes.
So, why did England get so big a population? Well, it reached its medieval peak in the 11th century. Probably around 6 million. By the time of the Black Death, that population had reduced quite considerably because of a long series of bad harvests, war and, finally, Black Death.
Following the Black Death, the population took a long time to recover. A shortage of manpower led many landowners to take up farming animals exclusively (something that was relatively rare in medieval England). Marginal and upland areas were de-populated as people moved to more fertile/manageable areas. It may sound strange, but for the survivors of the plague, de-population ultimately caused a large rise in living standards: peasants were able to command higher wages (despite the ruling class attempting to stop this), and, for many, wages in money at last.
The Yeoman farmer of Early Modern England was far more prosperous than he had been.
Rural populations are governed naturally by how much food can be produced and mobility within that population. A steady supply of work is necessary. This happened, until the rise of the next affliction: enclosure. The Black Death caused many villages to be abandoned, and the modern habit of claiming that one's village is in the domesday book is hardly a great distinction- most villages were.
Enclosure actually started in the aftermath of the Black Death, when landowners lacked the labour for arable farming, and turned to farming animals. For this, the huge field systems were hedged and fenced and made smaller, the basis of many areas field patterns now.
By the 18th century, landowners started to take an interest in farming, instead of sitting on their arses and living off the rents. (Although they did that, too). This mania for "improvement" caused a lot of damage, but most of all to the rural population. Many rural farm labourers were made unemployed, or made to be "day labourers", an uncertain future where a man must seek work every day or so. Rural poverty forced many into the towns.
In medieval England, only 4 towns existed with populations greater than 30,000. London, Bristol, Norwich and York. All were important trade centres or ports, or could be accessed via water. By the early modern period, more towns grew to this size and their populations were swelled by those fleeing rural poverty. However, this coincided with the end product of Enclosure: wool. Wool became the basis of England's wealth, and whilst initially, wool furnished mere cottage industries, nevertheless, an entire industry sprang up: spinners, weavers, dyers, hauliers, and associated textiles. George Eliot's "Silas Marner" was a weaver from Manchester.
With the towns getting larger, feeding them became very profitable (for the landowner: his former employees got the workhouse or much diminished living standards, and even his former rights to walk where he wanted was cut off. This was an era of mantraps and "keep out" signs).
So, to put it simply: Black Death caused low population; low population caused labour shortage; labour shortage made landowners find new ways to farm; new ways to farm involved enclosure and less need for labour; unemployment and lower living standards made the rural poor move to the towns; the larger town populations caused a demand for more food; enclosure meant more wool and industry was born out of this. Both resulted in better food production, distribution and in better wages (if poorer standards of living) in the towns.
However, the human cost is rarely considered. The wealthy make the poor unemployed, build workhouses, and then blame the poor for being poor. Does this sound familiar at all?