Checking out something in the ABRSM manual of scales and arpeggios, I note that those 'formed of the chords of the dominant seventh' start and finish on the dominant note (In C, goes G-G). That makes sense.
Those 'formed of the chord of the diminished seventh' start and finish on the leading note (In C, goes B-B). Surely that's not 'of the dim.7'. The dim7 of C is Bbb, I thought. How is this explained?