I'm afraid this is where employers are crafty...I used to work in a council-run care home, and if you did exactly 6 hours you got a 15 minute break, whereas as soon as the shift increased to 6.5 hours you were entitled to a 30 minute lunch break. Guess what the boss used to do as much as possible!
Anyways...pasta salads are always good if you need to eat at your desk, as are cous cous salads. If he doesn't object to you getting yourself hot water then mugshots are ok. Things like salad with cold chicken/boiled eggs/ham/new potatoes/cottage cheese/cheese etc are ok as you can eat them at your desk. Slimming world quiche or fritatta are also possible ideas as they're yummy cold.
Ummm...chicken drumsticks are good to nibble on whilst working, or have some food bags with chopped up peppers, carrots, cucumber, tomatoes etc and have with some homemade hummous (sp?) or another type of dip.
Oops, just realised that pretty much all of these have been covered! Gazpacho is nice, although a bit cold for winter, lol!
Sian xxx