As you say, life is full of confusions!Note - "Special locations" has different definitions in The Wiring Regulations and The Building Regulations.
However, to the best of my knowledge, unlike the latter (Building Regs) the former (BS7671) does not explicitly define "Special Location". Part 7 of BS7671 (comprising Sections 700 - 753) is entitled "Special Installations or Locations", but that does not help one to know which (of the situations addressed in Sections 700-753) they are regarding as 'Special installations' and which as 'Special locations'.
Kind Regards, John