This video from England says about itself:
The comprehensive investigation into the mass stranding of common dolphins (Delphinus delphis) that occurred in Cornwall on 9th June 2008 was co-ordinated by the collaborative UK Cetacean Strandings Investigation Programme (CSIP) ( http://www.ukstrandings.org ) which is currently managed by Institute of Zoology, Zoological Society of London (ZSL).
From Wildlife Extra:
143 marine mammals stranded in Cornwall in 2009
Seals, sharks and turtles also stranded
September 2010: Cornwall Wildlife Trust‘s Marine Strandings Network (MSN) has published its report for 2009. The report shows that, despite huge pressures, Cornwall and The Isles of Scilly still have a wealth of fascinating marine wildlife, from whales to sea potato urchins. The MSN examined and recorded 74 cetaceans (dolphins, whales and porpoises), 61 grey seals, 5 basking sharks and 3 turtles in the year. Numerous other marine species were added to the MSN’s expansive database which holds a vast amount of information going back many years. …
Two loggerhead turtles stranded alive in 2009 at Porthleven and Trebarwith Strand and were rehabilitated at the Blue Reef Aquarium in Newquay. These turtles were later released when fully fit in the warm waters of Gran Canaria. Regrettably, the remains of a 1.6 metre long leatherback turtle were found on Wanson Mouth beach. Among other things, these marine turtles feed on Portuguese Man-o-War and in 2009 these jellyfish-like animals were plentiful around Cornwall. More than 200 were reported to the MSN, which worked with the Cornwall County Council beach teams to safely remove them from our beaches.
Sea urchins tolerate acid water: here.
Porpoise beached alive on Texel: here.