>>76412800 (OP)Don't go to greggs every other day. If really want to, then at least see if you can find a greggs outlet near you and go there instead. Don't go out to eat just for the sake of going out to eat, unless you do it pretty infrequently or if there's some special occasion. If there is any meal you buy pre-made, look into how much you would save by making it yourself.
Buy food from a cheaper store (farmfoods/lidl/aldi/costco, whatever else there is). I like to cook food in bulk, I go to aldi and buy chicken breasts, rice, broccoli (and shit to season the chicken with if needed). I cant be bothered with cooking a meal after work, so its nice to be able to reheat that in a few minutes when I get home. I'm sure ill get tired of it at some point, but I'm fine with doing that right now.
If you really want to save money, look into buying an entire chicken and processing it yourself, rather than buying pre-cut (e.g. only breasts or thighs) meat. Obviously you can cook other things too, im just using this as an example because it's what I ate today.