The Bank of England has appointed Sarah John, the Bank's current Chief Cashier as its new Chief Operating Officer. Sarah has been Chief Cashier since June 2018 and also became Executive Director of Banking in May 2022.
All of the above banknotes portray Queen Elizabeth II.
Sarah John's signature appears on the following UK banknotes:
So it seems quite likely that we'll be seeing Victoria Cleland's signature on future King Charles III banknotes.