Today he quotes Edward Siecienski's new book on the Filioque writing on the Council of Hatfield which spoke of 'the Holy Spirit, ineffably proceeding from the Father and the Son, as proclaimed by all whom we have mentioned above, holy apostles, and prophets, and doctors.'
Like the Feast of the Holy Trinity there is the suggestion the Filioque clause of the creed had an English origin.
"The two questions raised by this confession of faith were how Theodore would have interpreted this teaching, and how long the filioque had been part of the creed in England. While it is possible that Augustine of Canterbury (d609) might have taught the filioque during his mission to England (given his connection with Pope Gregory I), there is also a chance that it was introduced by Theodore's companion Hadrian, an African by birth whose study of Augustine and Fulgentius would likely have included their teaching on the procession. As for Theodore himself, it is possible that he understood the filioque in accordance with the principles Maximus had enunciated years earlier in the Letter to Marinus, especially if (as is likely) the two knew each other in Rome. What is clear is that Pope Agatho, although busy preparing his own statement of faith for the Constantinopolitans (without the filioque), happily received the proceedings of Hatfield, including its confession in the procession of the Holy Spirit from both the Father and the Son."In typical Hunwickian style he ends by saying:
I wonder how those 'English Orthodox' and 'British Orthodox' who tell us that the Anglo-Saxon Church was "Orthodox", deal with the little matter of Hatfield.