Bertrams Smallfish Books Order

Ahead of official publishing I've got an order from Bertrams - "The UK's leading book wholesaler, library supplier and publisher distribution business". Interestingly they've ordered Big Eye Ben, Over the Wall and Two Robots. Interesting because the book I've had the most interest (and sales in Australia) is for There's a Bear on My Roof. It'd be really useful if Nielsen's captured the reason why a buyer has decided to order some books - maybe I'll have to do that myself.