Eff immediately, passengers flying with Air France & KLM, from London Heathrow airport, will now use the new Positive Boarding technology in Terminal 4.
After check-in, and upon entering security, passengers will be required to scan the barcode on their boarding pass at an automatic gate. The system will then verify your ticket and open to allow you through security.
Please note, however, that there is a minimum clearance time for entering the system, namely 20 minutes for Business Class passengers and 30 minutes for economy class passengers.
Make sure you allow enough time on the M25!