This is the official solution manual, directly obtained from O.U.P's website. Want to be *taught* physics and join the research frontiers? Then join us! https://t.me/HermitianSociety The authors’ solutions are included. These should not be distributed to students or issued in public, but are for the use of instructors only. Comments or corrections would be gratefully received. Tom Lancaster and Stephen Blundell, January 8, 2015 Email: [email protected] Webpage: https://www.dur.ac.uk/physics/staff/profiles/?id=9538 Email: [email protected] Webpage: http://users.ox.ac.uk/˜sjb (cid:13)c T. Lancaster and S.J. Blundell 2015 Solutions to Part I–III (Chapters 1–15)