It boils down to airport organisation. There are airports where you can simply walk to your connecting flight, but in cases where it is difficult to distinguish OD passengers from transfering passengers everybody is checked.
There are locations that fly to LHR that do not conform to international norms regarding international safety. Lagos, Nigeria, for example, does not conform to certain protocols, and Therefore is not considered secure. Rather than ferreting out individual flights, it is considered prudent simply to screen all passengers again.
Credit:stackoverflow.com‘
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