We used to have one, and indeed the same person still works in the canteen, but she packed in coming round as her sales were meagre. What ruined it was the canteen opening for breakfasts from 7:30am to 10am. Most people were going down there instead and as a result, they were already satiated when she came round at about 10:30.
Mind, her bacon rolls are out of this world. Thankfully she still does them.