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Ordinance Survey's OpenSpaces data lists the following:
CR0, CR2, CR3, CR4, CR44, CR5, CR6, CR7, CR8, CR9, CR90
But I don't know where CR44 or CR90 map to. I'm assuming CR90 is an additional block on top of CR9, but no idea where they put CR44... Don't have time to verify them myself, hence the comment.