Originally Posted by BA Executive Club

From 30 September 2016, Canada will require a new entry requirement, known as an Electronic Travel Authorisation (eTA), for visa-exempt foreign nationals travelling to Canada by air. Exceptions include U.S. citizens and travellers with a valid visa.

All eligible travellers flying to Canada will need to apply online for an eTA before travel. This requirement includes all British citizens. The cost of the eTA is C$7 per passenger, and the validity of the eTA is five years, or until the passenger's passport expires.

Customers can find out more and apply at Canada.ca/eTA