Originally Posted by
layz
HAL have been known for some short term thinking before (opening the T5C TTS with only one platform initially is a good example) but as far as I know they still build with future expansion in mind i.e. they did leave space for a second platform in C (which has now been completed), there's supposedly space for a T5C lounge too. It seems odd that they'd make extending the departure tunnel to a future T5D more complex than necessary.
If we have a look at this:
http://www.heathrowairport.com/stati...l_document.pdf
Page 328, it suggests a contingency passenger walkway along an extended TTS (from T5C to T3) is not required.
The plan is contingent upon an extended T5D already outfitted but maybe they do think that is far enough for a person to walk?