In message , Peter Masson
writes

"Paul Terry" wrote

Although I've seen that said many times, it must have been possible
in theory as the 1913 Metropolitan Railway Act proposed that an
already authorised line from Moorgate to Lothbury be extended to
connect with the Waterloo and City. Railway No. 5 in the bill proposed
extending the line from Lothbury to a junction with the W&C "at or
near the eastern end of the up platform of the Bank Station on that
railway beneath Queen Victoria Street".

Would this have been an extension of the Great Northern & City line?

Yes, it was taken over by the Met earlier that year.
--
Paul Terry