Also, I doubt if BA will accept bookings more than (I'm guessing) 340 days in advance (of the last flight in your itinerary). Most network airlines limit this to something between 320~360 days. Fares that are quoted then will be 'guaranteed' provided you pay in full and don't change your first international flight dates/times.
So your flights should be bookable by early Feb. Should fares go down (or if fuel surcharges go down) don't expect BA to ring you up and offer a refund. On the other hand if the fare/surcharge goes up, they won't come looking for more money.