Greek Credo in 11th Anglo-Saxon Pontifical

I have mentioned previously the 11th century Anglo-Saxon Pontifical known as CCCC Ms. 163.  It is Pontifical of a Continental type, and such, but, had some usage in 11th century England; associated with Abp. Ealdred of York. 

For our purposes, we have our attention turned to the section that deals with the Making of Catechumens, as it contains the singing of the Credo in Greek, and then, again, in Latin.   Go to page 46 [which is listed as page 43 in the actual manuscript]. 

What is interesting is that the Credo in Greek not only has musical notation, but, it simply reads in the following Latin transliteration of the Greek:

"Ke is to Penumato Agion tu Kyrion kezoopion to ek tu Patros ekporeugomenon ton si Patri ke Io sin proskynumenon ke in doxa, zomenon tolalisan diaton profiton."

That is:

"And in the Holy Ghost, the Lord and Life-Giver, Who from the Father Proceedeth, Who with the Father and the Son togenther is worshipped and glorified, Who spake by the Prophets." 

Now, in the next page, we have the Credo in Latin, and, unfortunately, the Credo is recited with the notorious interpolation in Latin with the well-known "qui ex Patre Filioque Procedit..." 

Of course, that the Credo was sung in Greek without the Filioque should tell us something.  The simple explanation that they copied a text and had no idea what it says doesn't seem satisfying, seeing that there ARE, in fact, 11th century Western books that have the Greek transliterated Credo but add a "ke Io" right after "ek tu Patros..."  While Greek may have not been as well-known as it should have been, this didn't mean there weren't Greek grammar books, and some individuals who understood the basics of the language.  

If some in the 11th century knew enough Greek to add the Filioque in Greek to a Latin transliterated Credo in some cases, then they could tell when they were looking at an untampered Greek Credo in Latin transliterated.  There are various speculative explanations for why they would keep the Greek Credo untampered with even in the second half of the 11th century in England; but, all we can say is that it was recited as such still in some places.