Here are the details of the LGW 737 fleet seating. It is in the Ultimate Guide feedback thread, but has not been updated into the main thread as yet.

737-300 - Rows 1 to 8 convertible, plus overwing exit at row 10 with extra pitch
737-400 - Rows 1 to 13 convertible, including overwing exits at rows 11 & 12. No recline on rows 10 & 11. Row 1 is DEF seats only.
737-500 - Rows 1 to 11 convertible, including overwing exit at row 8.