a firend of mine does this for his heating and plumbing business, every boiler installed he pays for a tree.
its a good ideawith his profit margin, its a good ploy, for our 50 quid job, or 120 quid job, its not really worth it, not for £12 anyway!
Also Ian, my customers thank me when i have done the job for them in the first place, the only time i'll reward them is if they recomend me to a friend.
why shoulfd i thank them, :-\i work dam hard, and run my business on honest moralsit would be interesting though to see whether they would rather go
for a tree, or ten quid cash in their hand for reccomending a friend!

john