Full marks on the R/T side malcolmf... I pretty sure I know what the current people are going to say..... but I always viewed "monitor....." as appalling radio communication practice and never used it. It's never so busy that a single call "Speedbird 123" would cause problems and at least one would know that communication had been confirmed. I sat next to a young controller one day who rebuked a pilot for calling him first even though he was the only aircraft on the frequency. I cringed under my seat..
At one stage there was the suggestion that landing aircraft should be told "monitor the tower on...." which, IMHO, is an accident waiting to happen. Problem is that a lot of these clever ideas come from people with little experience of radio comms.. they think it's like a telephone call. Maybe it is, but there are a thousand numnbers you might accidentally connect to!!
HD (ex Heathrow Tower ATCO).... now awaiting flames.