"Cleared to land" in the UK means that you are #1 and the runway is clear for your arrival. There are other clearances which may be used under good weather conditions where #1 can be well down the runway, or expected to be clear of the runway when #2 lands. Landing clearances of whatever type are only issued to the next to land and not nos 3, 4 or 5 as is the practice in the USA. Despite the amount of traffic US controllers handle you can only get one aircraft on to the concrete at one time.... and only a certain number in a given period so I could never understand why they use their "multiple" landing clearance procedures.