It's Pollicipes pollicipes the gooseneck barnacle
This clearly hasn't been fully answered, as the Wikipedia article cited shows 2 very distantly related goose barnacles & the bbc 'filmclip' is of Bill Oddie with a clump of common goose barnacles which these definitely are not. These 2, Lepas anatifera & Pollicipes pollicipes aren't merely of different species or even genus or even family but of different order according to WorMS ( http://www.marinespecies.org/aphia.php?p=taxdetails&id=733346 as against http://www.marinespecies.org/aphia.php?p=taxdetails&id=733346 ),but both in superorder Thoracica. The equivalent mammalian example would be superorder Afrotheria ( http://en.wikipedia.org/wiki/Afrotheria ) with both the Elephant & Hyrax being considered the same thing (& the dugong).
Comparison of the 3rd photo (p1020290) with http://www.marlin.ac.uk/speciesinformation.php?speciesID=4159# last (4th) pic gives a near perfect match & it's the only match in the Handbook of the marine fauna of NW Europe & Collins' seashore of Brit & Eur ; + the database MarBEF (of European species) http://www.marbef.org/data/aphia.php?p=taxdetails&id=534760 divides Scalpelliformes into 3 families but the Pollicipidae family only has this 1 species (ie no near relatives).