Miserlou,
"I have not noticed mentioned in this thread the requirement to use the word 'behind' twice in both the clearnace and the readback".
"Callsign, BEHIND the landing xxx, now departing xxx, line up runway 37 BEHIND and wait."
Flythrough beat me to it - this is not standard RTF phraseology in the UK (although it is ICAO phraseology).
Actually Flythrough it is "After the landing....", and "After the departing..." in each case. Behind is not used for reasons that I have mentioned before.
Maybe there should be an ATC FAQ section to cover these recurring topics, such as this one and "Descend on the ILS" etc.