Older vehicles driving in central London now need to meet minimum Euro emission standards or pay an extra daily charge. This is in addition to the Congestion Charge. The T-Charge (officially known as the Emissions Surcharge) operates in the Congestion Charge zone.
THCT currently has two vehicles that are subject to the T Charge. LX54 AYD and LX55 CFE. They have been set up on the TFL system to pay daily charge to drive within the zone. This will then be recharged to the vehicle user.