Cant see it sustaining Jet2 and EZY
I used to commute weekly MAN-ZRH-MAN with Swiss back in 07/08 and Tel Aviv was always a very popular connection destination back, then from Manchester.
It seemed that the majority of the Jewish customers also pre ordered special meals, even if it was just a sandwich. Therefore, I can imagine that having no kosher catering on board would perhaps be frowned upon!!!