What survives is about seven hundred and seventy leaves of vellum, bound in four volumes, three of the Old Testament and one of the New. The text is written in Greek majuscules, two columns to the page, without word division, with enlarged initials standing out into the margin at the start of paragraphs, and the hand has been dated to the fifth century. It is one of the four great uncial Bibles, alongside Sinaiticus, Vaticanus and Ephraemi Rescriptus, and the only one of them held in London.
Its losses are specific and they matter. Most of Matthew is gone, the surviving text of that Gospel beginning partway through chapter twenty-five; a section of John is missing, as is a substantial part of 2 Corinthians. Leaves have been lost at the beginning and in places later.
What it contains beyond the canon is equally worth noting. The New Testament volume includes the first and second letters of Clement, copied as part of the book rather than as an appendix, which is direct evidence of what one fifth century community was reading as scripture or near it. The original table of contents also lists the Psalms of Solomon, on a leaf that has since been lost, so the codex once carried a text that no longer travels with any Bible. Prefatory material includes a letter of Athanasius on the Psalms.