We have an Avios/Amex 2-4-1 redemption booked LHR-BOS and are flying out in First on a 747. Looking at the assigned seats, we currently have 5A, 5E and 5F; I have 5A, the wife's in 5E and 13 year old son in 5F. When I try to re-arrange to give my son 5A, it won't let me place any of us in 5F, with the message that we cannot be placed in a seat with a cot position (none of us have a baby!). My question is; should I leave us with the pre-assigned seats and just swap amongst ourselves when we board, or call BA to swap us? My worry is that we'll turn up and won't be able to sit in 5F, and my wife and I would like to sit together for the flight (4E/4F are unavailable). If I call them, it might highlight that we shouldn't have 5F anyway, and maybe they will move us. This will be our first time in First, so not sure how it actually looks. What is the impact of the cot? Is it attached to the seat, will it be in the way? Should we just take 3A/4A/5A? Any suggestions? Cheers!