The Forest Line proposal was to extend the W&C to Broad St - Dalston
Junction - Dalston East Junction - Hackney Wick - Clapton - Chingford. It
never got off page one of the study which produced it (1960s or so).

How was it supposed to get to Broad Street without going through the
Bank of England's vaults, or the Escalator/lift shafts for the central
line?