Just say no - it REALLY annoys me when crew / ground staff ask for this. They know perfectly well that those seats (64A/K etc.) are good seats and pre-booked normally by OWE - it is largely BA's own policy of making non-status passengers pay for seating which creates the mess of couples not being allocated seats together, so it's BA's job to sort it out and not mine. I have been asked this 3-4 times now and on the last couple have just politely declined without further issue.