"Many were abandoned in the 14th and 15th centuries when landlords emptied the villages to make way for more profitable sheep rearing"
but actual examples:
"Rand (Lincolnshire) is a classic, and heartbreaking, example of a medieval village that grew rapidly, until its landlords decided to boot out the villagers in the 1500s to make way for more profitable sheep farming"
"Like Rand, village life came to an end in the 1500s when the landowners forcibly evicted the villagers and destroyed their homes to make way for more profitable sheep farming."
"The ruins of Kirby (Northamptonshire) sit in the grounds of an estate, but you can clearly see the outline of some crofts, tofts and a buried fish pond. The village was always pretty small, and was finally dissolved around 1600 to make place for a formal Jacobean Garden."
So not 14th and 15th centuries, but 16th and 17th, ie as a result of protestant reformation.
Plus, evidence of medieval warm period:
"Pollen evidence suggests that cereal farming had ceased by 1350, while the corn dryers in the grain storage barns suggest the inhabitants struggled with a rapidly deteriorating climate."