Original sentence: In British English, a serving implement for fish, originally made of silver, now available in many other materials.The different usages appear to be due to British social class, where the term Fish Slice is used for the silver serving implement only in the Upper, Upper Middle, and Middle classes (who would not traditionally have had any word for any cooking implement, that being an activity performed by classes further down the social scale)
Edited sentence: In British English, fish slice (also known as spatula) is a serving implement for fish, originally made of silver, now available in many other materials.The different usages appear to be due to British social class, where the term fish slice is used for the silver serving implement only in the upper, upper middle, and middle classes (who would not traditionally have had any word for any cooking implement, that being an activity performed by classes further down the social scale)