Possible Clues:

• Is irritating, but the darned things needed them!
• The rocks off western tip of Isle of Wight
• What point into the English Channel will have you in stitches!
• The point of them is that they're to the south of England and one-eyed
• Pine products
• Is annoying in a way that's mainly unnecessary
• Mostly unnecessary feature of record players
• Causes irritation with eyes?
• Isle of Wight feature - irritates
• Paradoxically, almost pointless landmark