Someone beat me to the point about Scottish £100 notes!

Nonetheless, I concur with others - no-one really wants £50 notes let alone £100 notes - they are practically unusable in most transactions.

If you have a long-standing relationship with this woman, have you considered electronic payment? If not by IBAN transfer, by PayPal for example.

EDIT - And in typing I’ve been beaten to the PayPal point too!