How would this work? Does this mean it is possible to get the ex-UK fare for an itinerary not originating in the UK, but in Canada?
For example, I'm based in NYC but travel to LHR frequently. Could I buy an xONEx at the counter at LHR, travel originating at YYZ, and still pay the ex-UK fare? (making up the difference with a one-way AAward to YYZ?)