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I'm delighted to see LHR's tangle gradually be rationalised with the "toast rack" of T5, T2/LHR-East and hopefully T3 as well."
Yes, this is
essential to make the best use of limited space.
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Gates 47-49 only opened in early 2010 or thereabouts,31-33 some time later. These are stands 247-249 and 231-233 of the new T2 satellite building and were needed for capacity as the southern wide body gates on the Europier were closed. They are currently linked by the Europier to T1, but this newish part of T1 will be demolished before T2 is opened and the new transit system in in play."
AFAIK, the existing LHR1 will be demolished once the new LHR2 is open and will be rebuilt as part of a new LHR1/2. Without this, the new LHR2 would not be big enough.
After this, logically, LHR3 would also need to be rebuilt and "toast racked" to make the best use of space and to fit in with LHR1/2 and in particular to be aligned with LHR5. In these circumstances, there could see some "satelite sharing" between the 2 oneworld terminals (LHR3 and LHR5) if the transit is extended.