helencfo2,

Please refer to our Thomas Cook Airlines topic over on the Flights Forum. Also refer to our What Aircraft? guide. You are paying for an increase in seat pitch (2"), wider seats, upgraded meal, increased baggage allowance, complimentory drinks throughout the flight, priority boarding and dedicated premium check-in. If all you want is more room, you're better off booking extra legroom seats (you get more than in premium, just without the extras).

Darren