Max Rampwaite – The Controller may well have started his transmission at the point of rotation, knowing that by the time you receive your actual take off clearance the proceeding aircraft’s wheels will have left the ground.
He may well be advising you of the reason for the immediate take off i.e. jet on short final to land, which is only implying that the issue of a landing clearance is pending.
Finally, the Controller then warns you, of the small jet (as in physical size), that has just departed. It will be the same “light” vortex as your C152, hence no need to apply the 2 or 3 min vortex departure separation. All aircraft produce some vortex turbulence, and because you are at the opposite end of the “light” category, it may be prudent to arrange your flight to avoid it.
This is what you may have heard on the R/T. “G-XX, A320 3 miles final to land. Cleared immediate takeoff, caution possible vortex turbulence from the departing C550”.
I hope the above rings true and the Controller in question is indeed doing a good job and because of him/her your name is not Max HoldingpointWaite!
Otherwise the Controller needs sacking…………
