I had a chat about it with BH over breakfast.  He says you need a lot more of a rise to hand-clip than you do to machine-clip.
He did get the point about double-cutting and smashing the ends of the fibres.  (He has had a go at spinning since I brought a loan wheel home - and did 
pretty  very well for a first attempt.  So he has an understanding of how the spinner will use the fleece, which is incredibly helpful.)
I suggested that at some point when he'd just put fresh combs and things in, so his clippers would be good and sharp, we (that is, he!) could clip one.  I must say I was not bowled over by his enthusiasm... So maybe it'll be me and some new, sharp hand shears.  I think I better see if the Wool Board are still doing their courses...  See, I told you it was a good idea to start to plan well ahead!  

(And Philip, do let me know if/when you are in my neck of the woods... sounds like no-one here with machine clippers is enthusiastic about my funny little 'geeps'!)