Ok, Not strictly a webcam, but as it changes daily its worthy of a listing! Theres actually three images updated daily.

Choose between looking at the daily surf image, the daily lifeboat station image, or the daily Sennen Cove image. Not a webcam but might as well be and is still of interest especially if you're thinking about traveling to Lands End or Sennen Cove.

Lands End
Webcam type: 
Static webcam