LHRPony unwittingly demonstrates why having two types of conditional landing instructions with similar phraseology may not be a good idea.
One ("After the Landing") being a clearance where ATC retain separation responsibility and the other ("Land After") an instruction to the pilot to effectively land at his/her discrection
They were often confused, give one and the other was read-back to you. If the aircraft is on a short final do you have time to correct it? Does the flight crew understand the difference? If not correction is made, do you actually have the criteria to enable the one that was read-back to safely exist?
ad nauseam.