Thanks Whopity, looks like I've been doing it right after all.
Me I log all sorts of stuff (tailwheel, instructor, class of microlight, test flying...) because it's amazing how many times somebody asks these sort of questions for the sort of non-standard flying that I tend to do. Sooner or later, somebody will want my time by sole reference to instruments, and if they don't, it's interesting to me.
The advantage of an Excel based logbook of course, is that I'm not limited to number of columns.
G