First, I need to confirm if POA is indeed Primary Science or another subject. Marshall Cavendish publishes various educational materials, so clarification might be necessary. However, since the user mentioned "patched" answers, it's possible they're referring to updated solutions after initial errors or a new edition.

Next, the user wants a "proper write-up." This could mean a structured explanation, like a guide on how to use the patched answers effectively, or an overview of what the patched version includes compared to the original. They might also want advice on finding these resources legally. Given the mention of "patched," there might be a version difference to consider.

I should address legality first. Providing or using answer keys without permission could be against copyright. It's important to mention that. Then, I can outline what a patched workbook might involve—like corrected errors, updated content, or additional materials. Maybe there are errata sheets or official patches from the publisher. Suggesting legitimate ways to access support, like contacting the publisher, using teacher resources, or study groups, would be helpful.

Also, consider the user's intent. Are they a student, parent, or teacher? That affects the response. If it's a student, focusing on study techniques and resources that don't infringe on copyright is key. If a teacher, maybe official channels to get updated materials. The user might seek quick access to answers but need guidance on ethical alternatives.