Been doing the nod since the early 80's when I started out....I find the responses mixed, some will nod others are oblivious or just plain rude.. On my way back from picking my cat up I gave a couple of young 'ped riders a nod, they nodded back in unison, which I thought was nice. I really don't care we all have to start somewhere and I find that your behaviour influences others behaviour. Perhaps it's up to us to spread the word!