The discussion centers on finding popular science books that effectively integrate physics with the necessary mathematics. A recommendation for MIT's OpenCourseWare (OCW) is made, particularly the 18.01 calculus course, which serves as a foundation for introductory physics courses 8.01 and 8.02. It's suggested that engaging with OCW can complement A-Level studies, although school classes should remain a priority. The book "The Road to Reality" by Roger Penrose is highlighted as a suitable choice, as it aims to present complex physics concepts alongside the requisite mathematics, though it may be challenging without a solid calculus background. Other resources mentioned include additional physics texts and the "Mechanical Universe" series, which are suggested to enhance understanding and appreciation of physics. The conversation emphasizes the importance of a strong mathematical foundation to grasp advanced physics concepts effectively.