From the Thomson website:
Enjoy a little more room onboard
May be next to an exit or by a bulkhead
Limited availability - book now!
Note the bit that says "may be"
On the 787,those seats have 36 inch legroom,the rest of the cabin has 33 or 34 inch legroom.
Personally, I would prefer these seats to a bulkhead seat as you can stretch your legs under the seat in front of you.
Sorry you weren't happy but,to me,it seems you had what you paid for