Is this the place we complain about our bin men? A while back, my bin was a foot back from the edge of our garden boundary and I watched a new, eager young chap go to grab it and do his job... until the guy sucking lemons told him off and to leave it. They're not getting a tip.
On topic though. Any of the services I come in contact with regularly, rotate so many staff that I don't feel any of them are deserving of a tip. However, I do tip my barber at Christmas, he's a cracking chap always has drinks on offer and gives you homemade mince pies at Christmas.