Thanks for replying. Good idea about the centre four seats.

As far as it's possible for me to determine, it's a -200: the seating plan shown by Aer Lingus during booking matches SeatGuru's plan for a -200, and I've found several references to Aer Lingus using -200s on their DUB-MCO route.

The extra charge seats were row 11, but saw somewhere that if equipment change becomes necessary, row 11 occupiers get moved toward back of plane with nothing to show for their extra charge.

I suppose as it's a mainly nighttime flight, the missing window shouldn't matter too much - I'm just a sucker for sunrise at 30 odd thousand feet.