The Coryton closure was not a one-off, but a $45m investment in a cat cracker is certainly a rare event.
From the independent.co.uk
The cat cracker, as Stanlow's 1,100 workers refer to it, refines the thickest, toughest-to-process residue of crude oil and is the biggest of its type in Europe.
From the independent.co.uk
He lists blue gill, shell cracker, speckled perch and cat fish as examples.