Difficult question. It's like, I just paid almost 40 € (~26 £) for a new book (I'm a book-addict), but I think that's the biggest amount I'd spend on a regular shirt or pants.
But, I found an answer like this: If I loan money to someone, I don't even bother to ask it back if it's 3-4 £. If it's 6-7 £, I won't want it back unless I have a shitty financial situation myself, or the person is not a very close friend. 13 £ and up, I'll want it back at some point. But I answered 50 £, since that's the amount I'll want back no matter what.
I consider that I have enough money for my basic living (I get about 490 £ per month, minus my rent, which leaves me ~330 £), but I really cannot afford to buy anything really big, like furniture, expensive electronics (tv, dvd-player, computer), clothes from anywhere but H&M, and so on. But at least I'm living better than in my student days (students get less money than the unemployed in Finland), and I can afford my necessities, like food, books, gigs and cd's.

But it really shows that when you get more money, you spend more money. I don't understand how I could manage with about 100 £ per month when I was a student. Because it feels that I lived basically the same way as I do now.
But, I bet when I get a real, well-paying job (and well-paying for me would be like 1000 £/month), I'll just buy books and beer and whine about not being able to buy a new sofa or something.
