Specifically, was the filioque introduced to the island by Norman priests / bishops?
To reply to your specific question: The filioque was recognised by the Synod of Hatfield in 680 under Theodore of Tarsus. It is unclear whether the Filioque was in use before that date.
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Regarding the changes the Normans brought: Those can't be underestimated. During the course of a decade almost the complete Anglo-Saxon hierarchy had been replaced by Normans. Monasteries were regulated according to the Benedictine and Augustinian rules. Clerical celibacy was enforced. In one word, the full reform program of Gregor VII. was introduced.
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