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There is a way to change seats which I mentioned a little while back in another thread (can't remember which thread though!) Follow these steps:
1. Go to the booking and select web check in
2. Do your seat selection at the start of check in
3. DO NOT PROCEED any further with the check in - it will still retain your seat selection
4. At anytime before OLCI closes you can return to the booking and repeat these steps to change the seat.
5. Once you get to the point where there won't be any better seats, that's where you continue with the process and finish the check in. Alternatively you can just go to the airport and get a BP there, although very rarely they may reassign your seat for operational reasons. This can still happen even if you've printed a BP at home.