Thanks Cally and LJ.
Yes, low doses bring their own complications. I usually need 2 units at lunchtime, but if my BS is slightly higher then I'll use 3. Doesn't sound like much, but it's a 50% increase for me which can make the outcome a little more uncertain.
I've heard of pens in the US capable of delivering not just 1/2 unit doses, but 1/4 units even! That's got to be less than the wee drip at the end of the needle for Christ's sake! Still if there's a 1/2 unit pen for grown-ups out there, I want it.
All the best,
Fergus