I am planning to book Outbound flights in a couple of weeks using my Amex voucher. I have previously booked Return legs online at midnight on the appropriate day, and phoned up during the following day to get the two bookings linked, and hence half the avios back. However, on this occasion we will be on a cruise ship mid-ocean when the return flights open up. My question is: will BA give me any issues if my phone call to link the two bookings happens a couple of weeks after the Return flights have been booked online by me?