He concluded that the Trojan War was actually fought in Cambridgeshire England by the Celts (Homer never actually calls the attacking forces the Greeks, but rather the Achaens, which means Sea People) and that the most likely cause of the war was the abundance of tin in the region, a vital material in the production of bronze, which was very rare in ancient Europe.
First editions of his book Where Troy Once Stood are fetching over $500 on E-bay, if you can find one, but he has recently released another edition.
Here is his website, http://www.troy-in-england.co.uk/trojan-kings-of-england/trojan-kings-of-england.htm
Check it out and see if you can find a copy of his book at the library. It is the product of a life-long passion and is meticulously researched and documented. He has pretty much convinced me.
There's also Edo Nyland, who adopted as his own the idea that the Odyssey actually refers to a voyage in the Hebrides etc, while Samuel Butler claimed that the Odyssey was written by a woman living in colonial Greek Sicily. As a sidebar, Eberhard Zangger claims that Plato's tale of Atlantis actually was sourced in Egypt, but references the Trojan War, and that Plato et al never recognized the national epic of Greece in the details.