The Wars of the Roses interrupted things to be sure, but that was mostly aristocrats and their retainers cutting each other up, which was probably welcomed as much by the people as we enjoy our politicians leaving Washington for whatever reason so they can't do any more damage to us. Come to think of it, there was probably an advantage to having the monarchs out of the country fighting so much - it limited the time they could come home and dream up stupid decrees to limit business and competition to line their own and their syncophants' pockets, as Medieval monarchs were want to do.
Now, you've got me when it comes to the turmoil surrounding the Tudors and particularly the Stuarts. But that's not the Medieval period, we're to the Early Modern by then. And by that time the English had bested the Flemish merchants and had seized the preeminent role in the wool trade and textiles.
There are those who attribute to the returning troops from the Hundred Years War (and they must have been pretty old by then) the beginning of the Wars of the Roses.