Pin Head - it is to distinguish from ALL flight levels AND headings ending in zero. Your post alludes to the use of wun hundred/two hundred degrees being permitted to be said just as, which is incorrect, "hundred" is not to be used when referring to a heading.
reportyourlevel, thanks for that. Your CAP493 reference no longer exists, Attachment/appendix E has been totally rewritten and all examples of phraseology removed, nothing in attachment/appendix E refers to headings and degrees. However, although again slightly changed, the CAP413 Chapter 3 page 1, and now para 3.3 does state exactly what you wrote, cheers.
