I don't know why, but always, when we were instructed to report rwy in sight, we got the landing-clearance just after our report or we were transfered to TWR for the landing-clearance just after our report.
It's not nice, when you have the rwy in sight at about 800ft, then you have to contact the TWR where another aircraft is talking... and then you get the landing-clearance with a lot of instructions for the vacation so you don't have time to readback the clearance before touchdown!
It's not always like that, but I'm just wondering, because there is no need to have the runway in sight for the lading-clearance!