As the above poster points out the TV is on a bracket which pulls out from under the seat hence the seat width is slightly restricted (I'd assume it's difficult to eat while watching TV ?)

I'll assume you are on the cheapest tickets and don't have status, so there's a reasonable chance that the long legroom seats on your flight will be preassigned/selected by those with the ability to do so (status holders, full far ticket holders). Consider joining BAEC ahead of your flight just in case that gives you the slighest of edges over someone not in the BAEC.

I'm not sure on how it works on economy, but you may be able to select your seats at T24 using online-check in and pick your exit row seats (can someone clarify?)

Infants go in the bulk head seats, not the exit row as suggested above, so that shouldn't be a problem for you - although you might want to consider bulkhead seats as it has extra knee room (but not really much extra leg room).

Best advice would be turn up at the airport as early as possible to be in line when check in opens for your flight - ask politely at check in for reassignment to an exit row and see how you fare.

I've been told previously that the exit row window seat legroom is restricted by the inflatable slide unit (aircraft dependent). So pick the aisle and central seat if given the option!

Best of luck!