FR-
Re- LTN base winter 2012/13, the only recent info. I have heard is Luton-Tel Aviv increasing from daily to 9 pw.
This service seems to be very successful for EZJ despite El Al being well-entrenched on the route.
At present EZJ seem to have around 15-16 airframes overnighting with another 4 arriving early morning and turning around.
Sorry I can't offer more help!