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When you book medical seats for a disabled person, you should also be allocated a medical seat adjacent to accompany them. The aircraft type is known (Airbus A330-200) but given the medical seats are in short supply, not all your party would be able to sit in them. Medical seats on the A332 are located on row 1 (in the premium cabin) seats 1 A/B, 1 C/D/E and 1 H/J in a 2-3-2 configuration, then (in the economy cabin) row 8 D/E/F, 30/31 D/E/F in a 3-3-3 configuration. The remainder of your party can be seated pretty close to you subject to availablity. I would call closer to the time to discuss your needs to make sure they have noted you need 2 medical seats. There's extensive aircraft information on our What Aircraft? guide (link below) including a link to the seating plan for the A332. You can reserve seating (officially) from 2 months before your departure date but the flights are often uploaded on to the system 3 or 4 months prior so you can often choose them before that. I choose my seats in November for my flights in 3 weeks for example. The medical seats are exempt from selection just in case they are needed.
Darren