No nimbus.... I think you're wrong..... It's all far more devious!
I think that her initials are for Betty Poop and that in order to throw us off track, Betty turned the number from 27, which would make it 1927, which fits in perfectly with Betty Poop.
You just assumed that 'she was a 'he', which is also why she didn't respond to your suggestion that if she were are real man, then she would have had her little lady put up the shelves etc! See, mine all fits!
Betty is probably one of those dodgy Brits you were speaking of the other day, hiding out in Greece!
Don't worry Betty..... we won't give you up! Your secret identity is safe with us! Anyway, Nimbus would only worry that if he gave you up, then you might also hand him over!