For all those runners/joggers who frequent Greenwich Park and are completely shocked when runners say 'Hi' as they pass, or try to make some form of eye contact to say 'Hi', I'd just like to try and explain why we do it. Basically, we're not mad, short of friends, or trying to befriend you to try and get some of the money that your Uncle George left you, it's just polite, informal, and simply friendly runner's etiquette. And if there's any cyclists who cover the SE London, Kent area, it takes nothing to nod back as you pass.
Rant over !!