DD2 is in university in the US and has a chance to study in London for a year. She hasn't nailed down any financial details yet but is pretty sure from reading the study abroad brochure that her financial aid package will cover tuition/fees, books, food and rent/halls plus transatlantic travel money and 'sundries' (though those two items are generally underestimated ime).
The grey area is walking-around money/living expenses above the normally underestimated 'sundries', and money to possibly allow a bit of very low cost travel in Europe. My understanding is that she won't be permitted to work while there.
My question is, how much would the average frugal student spend on snacks/ tea (no coffee for DD2)/ clothing/ footwear/ toiletries/ tampons/ cheap haircuts/ occasional cinema and cheap eating out/ British phone/ interrail/train-boat-Ryanair to Dublin to see the many Irish rellies (no accommodation costs in Ireland)/ and travel costs within Britain to see various sites (youth hostel accommodation anticipated). DD2 is used to a tight budget and supports herself completely for that sort of expense right now.