My lunches at work make use of a TESCOS and a works microwave. When possible I pre cook and heat up. Sometimes I get chicken thighs from the hot deli counter, skin off and make a big bed of salad. It looks, smells and tastes amazing. Buy a weeks supply of lettuce, red onion, peppers cucumber, pickled beetroot and gherkins etc. 
On green days I buy microwave packet rude, mushy peas and quorn meat balls, add curry powder to the mushy peas. 
I also microwave a popodum for 1 syn.  
Microwaved omelettes , add spinach, spring onions, peppers chilies ... with salad or in 2 wm toast.