i can see em paying you
not

I would of given an invioce if I turned up, if they did't pay, the bill would of gone to head office, which means the manager wouldn't of been doing his job properly by not contacting his suppliers.
Other jobs i do, if they are booked in at a certain time and no one is there I still invoice and GET PAID. For instance most the whetherspoons pubs I do, I will clean outsides before their turn up at 6am, if they are not there by 6.20am I go and they still get payed, I don't have time to hang around for anyone.