<human>: Hi everyone. As the title says, I need some ideas for lunch I can take to work. The problem is; we don't have a microwave or toaster or anything, so I can only have cold food I make that morning/night before. We have a kettle but don't know if it'll be much use for food.

At the moment I'm making a make-shift greek salad every day, which consists of; lettuce, cherry tomatoes, cucumber, green olives and feta cheese. I've been having that every day for a about 3 weeks so I'm getting really bored of it. Before that I was making sandwiches every day which were; whole wheat buns, beef/chicken/ham slices with lettuce and no butter/mayo/anything. I thought it was kind of healthy but I could be doing better which is why I switched to salad.

Any ideas would be great! I'm on a budget so nothing too extravagant and also I live in the UK, but don't know if that'll make a difference or anything other than brands.

Summarize the given text in a few sentences.
<bot>: Cold food, not too expensive, healthy as possible, try and avoid brand names as I live in the UK. Thanks!