I used to get mixed results with runners in Clapham. If they were as plodding and sweaty as me, they used to smile back or say hello, but the more professional-looking, decent runners used to fly past with a bit of a sneer. Where I live now, runners tend to smile back or respond if you say hello. On mile 10/11 yesterday, I got a "keep going, you're nearly there" from another runner who I'd seen going the other way about 30 mins earlier... I must have looked like death warmed up... I did have enought puff to laugh and shout "Thanks!"...