Thank you for the replies. No, I didn't Google, as I was looking for a recommendation. My previous experience with hand-helds, quite a few years ago, was that they weren't much cop. It would certainly be more effective to use the house vacuum, but it's not practicable for me as it means trailing a lead across the pavement, and these days an accidently-on-purpose trip would probably lead me to being sued. I've tried it before, and it is amazing how people seemed to be drawn to the lead like moths to a flame.