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Alan Savory's 'Norfolk Fowler' (1953) has; "There is a place far out on the sands somewhere between High Sand Creek and Stone Mell Creek that is called Blacknock. It is a patch of mud covered with zos grass and full of blue shelled cockles known as 'Stewkey Blues'. It is a famous place for widgeon, but very dangerous to get on to and off, if one is not too certain of the way on a dark night. The women cockle gatherers from Stiffkey (or Stewkey, as it is sometimes called) who have double the strength of a normal man, go right out there between the tides and get a peck of these cockles and carry them back to the village, miles across the sea and saltings."
Cheltenham Chronicle - Saturday 11 November 1905