My friend suggested we meet up at a local chain restaurant as they are currently doing kids meal free with any adult main. On arrival she said that she has taken advantage of this offer lots over the holidays. She ordered a £7.95 salad and tap water. When we came to pay she put out £8 cash. I was paying by card so tried to subtly hint saying 'would you like me to add a tip' to which she replied 'I'm not working at the moment so i don't tip' and then walked off to take her daughter to the loo. I paid and added 10% of my meal. Is she being unreasonable to take advantage of this offer so often (about 4 times over the last 2 weeks) and pay the bare minimum or maybe she is just being savvy? I would feel really awkward returning to the same place knowing I was being a bit of a cheap skate. So as not to drip feed, it is true that she isn't working and has a preschooler. On the other hand she has a BTL (no mortgage on it) and has chosen not to work. However she is a single mum so this makes it harder. I suppose I most impressed/taken back by her confidence in saying she won't tip.