Just a quick minor hijack:
I always thought the reply to a clearance to land was not 'cleared to land callsign xxx' but ' Land 24R Callsign xxx'
Perhaps someone might confirm
CAP413: "Runway 24R cleared to land c/s".
Back to topic... Personally, as a GA wannabe doing ATPL groundschool, I've got enough time in my life to add a runway designator if required.