This consultation document from 2015 is part of the bundle of documents in the Phase 2A hybrid bill. It has relevance now as it outlines alternative schemes to Phase 2A. Although the exercise is meant to begin as an honest assessment of whether a certain proposal for a scheme is in fact the best one, obviously this study was carried out in order to prove that Phase 2A was the best option to progress with.
But in the event that Phase 2A is not resurrected, these options would presumably form a starting point for the inevitable upgrade that will be required.
https://assets.publishing.service.g...33f99d2/rail-alternatives-to-hs2-phase-2a.pdf
The document outlines the following key constraints (as others have already said in relation to this)...
(from page 6)
Three options (from a range of possibilities) are highlighted to demonstrate the range of possible alternatives.
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And here are the construction cost comparisons...
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One thing that seems obvious from this is that the land on the line of route immediately north of Phase 1 really must be held onto for the time being.
How would the cost of the Handsacre junction compare with these?