Metronet and Tubelines have revived their plan to make their staff book on duty using a 'smartcard'. This would carry biometric data with a capacity to include everything from fingerprints to credit records.
LUL has no plans to foist this on its own staff - yet, but station supervisors will be expected to operate it for booking on Infraco staff and contractors. Ironic really, as the company probably thinks it can develop this system into a robot SS that will replace humans.