What's the Name of That Book??? discussion

This topic is about
Falling Apart
SOLVED: Children's/YA
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SOLVED. British YA fiction. Two sisters, one is approached by a wealthy boy who dates her for a bet, quotes John Betjeman teashop poem to her [s]
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Books mentioned in this topic
Falling Apart (other topics)A Little Lower Than the Angels (other topics)
The author was female and the book is about two sisters, one of them is called Tina. One sister is approached by a wealthy public school boy who asks her out, and she falls for him. Eventually it turns out he was dating her for a bet with his friends and actually considers her beneath him because she's not rich.
In one scene the boy and girl are in a teashop and he quotes the John Betjeman poem "In a Bath teashop" and asks her, "Well, am I a thumping crook?" The girl doesn't know who John Betjeman is and it plays up the differences in their education. I think she has a pregnancy scare at one point and the tone overall is very bleak. She is devastated when they break up and possibly attempts suicide.
For ages I thought the book was A Little Lower Than the Angels because the title is a line in the same poem (yes, I know it's originally a Bible quote). But I've just googled that and it's a totally different book, so now I have no idea!