Rubramoena rubescens (Picton & Brown, 1978)

29 May, 2011.
The Garden Centre, Loch Fyne on the west coast. 
13 mm fully grown animal at 14 m on the hydroid Halecium halecium. Water temperature 9.5°C.
Sony NEX-5 in Nauticam housing, 18-55mm lens, Inon UCL 165 CU lens, SubSee +10 dioptre and 2 x Inon D-2000 flashes.

for more information about this species go to one of the links below
nudibranchs of the british isles sea slug forum