A small organic veg/fruit box (which claims to be "perfect for one person", and this week includes fairtrade bananas, carrots, tomatoes, zucchini, lettuce, potatoes, apples, and mango) is £10.95 + £0.99 delivery fee. (This is through Abel & Cole, I also considered
Growing Communities as that's local to me, but they don't deliver and they require you to order by the month rather than the week, so I figured A&C was a better trial option).
I'll find out on Wednesday what comes, and how decent it is.