I’m told that between the sixteenth and twentysixth of October, EZS flights 932 and 931 LTN-ZRH-LTN will be operated by 319, before returning to 737 from the winter timetable.
It’ll be in ZRH between 10:45am and 11:15am, so it should be leaving LTN around about 8:15am, and returning around 12:00pm, If that’s of any use to your plans to get to see it for yourself.