5 aircraft and 5 cabin layouts, from the 737-300 to the A330-200. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 5 Jet2 aircraft here: the Airbus A321, the Airbus A321neo, the Airbus A330-200, the Boeing 737-300 and the Boeing 737-800.
The Airbus A330-200, with 327 seats: 327 Economy in its main layout.
The Airbus A330-200, with 30" of seat pitch in Economy and seats 18" wide.