It is easy to lump Uillean together with craic and saisiun and bodhran as the most obvious excesses of the "Celtic industry" version of history. But I certainly find the Shakespearean "woollen pipes" very intriguing. I have pondered this vexed question for decades, and I havent come up with any other acceptable theory for what Shakespeare meant. On the other side of the argument, though, you would sort of expect the odd example of somebody's diary saying "bought a nice set of uileean pipes today" in 1650 or whatever, if the term had really been in use since 1600. My head tells me the "modern bogus invention" is prtobably right, but I have a sneaky affection for the idea that Shakespeare might just have picked up the term in London, and been right.