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

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Monster Maker
SOLVED: Children's/YA
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SOLVED. Children’s book about a boy finding somebody’s figurines. [s]
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There’s also some focus on the boy’s bicycle, I seem to remember a scene where he’s cycling to or from the workshop in the dark as he often does and the headlamp on his bike goes out.
I would’ve most likely read this book in school, between 2001-2006, and I believe it was a relatively recent book. I may also have been by a British author and set in the UK. I don’t remember the cover but it was certainly a paperback.
I apologise if I have misremembered any of the details, but after speaking to some friends who also remember parts of this book I’m sure this is all at least mostly accurate.