[The Squatter of Amon Rûdh]

In the Lost Tales, Tol Eressëa breaks to become Ireland and modern-day England, Scotland and Wales; Kortirion is the city of Warwick, and Tavrobel is Great Haywood, also in Warwickshire.

Tolkien had this to say on the subject (see the commentary to The Cottage of Lost Play for more details):

I was from early days grieved by the poverty of my own beloved country: it had no stories of its own (bound up with its tongue and soil), not the quality that I sought, and found (as an ingredient) in legends of other lands. There was Greek and Celtic, and Romance, Germanic, Scandinavian and Finnish (which greatly affected me); but nothing English, save impoverished chap-book stuff.