I was recently browsing a waterstones as you do and although I really have too many chinese books already I came across a book Edexcel GCSE Chinese. This is probably unique to the UK as GCSE's are our qualifications but I've found it to be pretty interesting.
It's quite a lively book with pictures and workings, much like the kind of thing my kids work with in subjects like science etc. Very different from the books of my youth but I've come to like it quite quickly. Its slightly broken for me because I don't have the accompanying tapes so cannot do the listening exercises but the written exercises are pretty much exactly aimed at my sort of level.
That in itself is interesting as I study chinese for my own personal satisfaction not for qualifications so I've never really guaged my level outside of chinese pod.
Anyway I thought some of you may like to look it up
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