Healthy lunch at work

I find it quite hard to eat healthy at work and not spend loads of money at the same time. I feel like I waste so much money on food at work. If you are spending £5.00 a day and that's not including coffees, that comes to roughly £100 a month! on what? a sandwich, drink and crisps? shoddy salads? I rather spend that on makeup! My colleague and I do a salad ingredient shop and get a packet of wraps once a week, split between us. We make our own salads at work, sometimes we add prawns or chicken but mostly veg. We always dress it olive oil and lemon juice. Heres one we made earlier!

What do you do for lunch?