your tawdy insults much as I expected.
Beacons around Brecon were apparently to warn about invading English, which presumably happened pretty regularly. While I don't doubt that signal fires on top of hills in England predate the Armada, I've found no evidence a co-ordinated system was ever used in anger to protect the country prior to it. Can you produce any?
Calling somewhere a beacon and calling it Beacon Hill are not the same. None of the Beacon Hill descriptions I've looked at show that specific name predating the Armada, though almost all of them mention it. Obviously the tallest hill for miles around would have had a historic name, esp as many of them were ancient hillforts. At least a couple, Harting Beacon and Lytchett Beacon were apparently renamed after the Armada. I think your suggestion that the name Beacon Hill was widely used before the Armada needs verification.