Anglo-Saxon band not Anglo-Saxon?

[AlbredaA]

Ok, I'll bite:
 
I'm starting in on the threaded in pattern from St John's Cambridge, which  I 
thought was Anglo-Saxon, but now I'm seeing (courtesy of Christina Krupp) 
that  Penelope Walton Rogers says on pg 219 of Cloth and Clothing of A-S 
England 
that  this piece has recently been proved to be of medieval origin instead, 
but she  gives no further info as to where one can read more about this change 
in  opinion.  Googling it doesn't seem to be helping.
 
Any ideas where I can find out more??
 
Thanks!
Susan Bingham (SCA Albreda Aylese)
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