Originally Posted by palomi
Theres nothing in the rule book that expressly forbids travel from another country to the UK...
other than item 6 of the BA Amex Reward Ticket T&C
Redemption flights and reward tickets may only be used for flights on BA mainline services which have a BA prefixed flight number. Travel on franchisee, codeshare or alliance airlines is not permitted. Return flights must be booked at the same time as the outward journey is booked. All travel must originate in and return to the UK.