Angels holding banderoles. Sarah Carrig Bond's dissertation locates this deposed capital at the entrance to the choir, in the rond-point [check if it is south side]
Now in V&A.
Reference
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The inscriptions are the first verses of the gospel. In order of the citations presened here, we find Matthew (1,1), Mark (1,3), Luc (1,5), and John (1,1).