BBK in a certified copy of an entry

Dear colleagues,

I am doing the translation of a certified copy of an entry from England to Spanish of Colombia. So far, I have translated 99% of the certificate. However, at the right top it says "BBK" next to a number. I wonder if "BBK" is an acronym that stands for something (I have searched but failed to find one related to this context) or these letters are part of the number.

I would appreciate any help you can provide.

Regards,
Rana32

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