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It seems that, in the early/mid 1960s, that the Spey was a very popular engine. Here is a quick summary of 3 Spey engine design proposals I've found mentioned in one book: Attack Aircraft of the West by Bill Gunston.
TFX / F-111
Allison and Rolls-Royce's AR.168 (license-built Spey) was considered the best engine proposal by some margin, but was marginalised due to its perception as a "foreign" engine. It is interesting to speculate if the Spey might have proved less troublesome than the early TF30.
A-4 Skyhawk
1964's Spey-Skyhawk would have increased the combat radius with 4000lb load from 200nm to almost 600nm.
Mirage IV
BAC promoted a Spey engined Mirage IV as a TSR.2 replacement.
TFX / F-111
Allison and Rolls-Royce's AR.168 (license-built Spey) was considered the best engine proposal by some margin, but was marginalised due to its perception as a "foreign" engine. It is interesting to speculate if the Spey might have proved less troublesome than the early TF30.
A-4 Skyhawk
1964's Spey-Skyhawk would have increased the combat radius with 4000lb load from 200nm to almost 600nm.
Mirage IV
BAC promoted a Spey engined Mirage IV as a TSR.2 replacement.