jeanyqua
What Raglan2 said is absolutely correct.
I booked a Thomson holiday on-line and although it did state that 'Select Your Seat' will be available from 60 days prior to departure, I received an e-mail from Thomson 12 weeks prior to departure inviting me to select our seats.
Perhaps this only applies to flights booked on-line and it does state 'Availability and price varies by route'.