Does it not state, either in the back of the brochure, or on the holiday invoice, that you should check your tickets as these will give confirmed timings.
Is there not a note esp in the brochures that as holidays are planned so far in advance, the timings are only provision, and draws to the fact that tickets will have the final accurate times. Same regarding terminals at the larger airports I think. If it was a large time change, from day to night flight or over 12 hours potentially, then they may offer some sort of compensation, and will draw your attention to this.