>The thought 'miniature fold drive' came to mind followed by 'wait they
>don't have computers yet do they'

Caroline Norden is disappointed in you for not remembering her work. Analog computers with sights and dials and cams inside to do the calculations are perfectly in idiom.

Allie Turing is also disappointed, but she's more understanding. The Neuroi don't use any known form of encryption, so Bletchley Park is probably up to something different right now. Also, most witches can't carry supercomputers.

She does appreciate not having to worry about her gayness being discovered in this timeline, though.