No just for new customers i pay. Never canvassing time unless they are on there first few days while learning. Pay between £5 and £10 per lead and after all the dropouts and 1 off brigade customers you will be quids in or better still have canvasser replace any dropouts they get, i dont get them to replace as even if half drop out im still quids in.
Happy growing and i hope to hear your canvass success story soon.