@Edent I've enjoyed your posts, Terence, and I'm sure I'll enjoy some more when you feel ready! Even the ones which are quite mysterious to me at the start, eg EMF or whatever it was, you have a way with words that helps me wanting to find out more. I hope the urge returns; I never found a way back to blogging, half way through my "My life in computers..." series (only really possible if you're VERY old).