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...all to do with the tidal sea movement
Definitely tubeworms of some sort, Sabellaria perhaps.
...teach me to make rash judgements at beer o' clock. Never quickly brush over these pics when you've had a beer (only 3 honest). Completely in agreement with Sabellaria as I have found these tubes as well. Apologies all round. And no more beer o'clock for me.
This site may give lots of info
....be good to edit and move to invertebrates :)
Lat/Lng: 50.730330555556, -2.923675
OS grid ref: SY349927