This thread has been running for over a week on the British Airways forum. I think that there may be many here who would be interested but don't often look at that forum.
http://www.flyertalk.com/forum/briti...dining-us.html
The bottom line:
No more pre-flight kosher dining at JFK, and if you are travelling in C then no food on board either if the flight is sleeper-service!
F, WT and W can have kosher food on board.
So either upgrade to First, downgrade to economy, or go hungry!