Originally Posted by
MNManInKen
Neither HS2 nor Crossrail will solve the problem for most of us here at the West side of Central London. Boris Airport will never be built, but if it were it would require additional high speed transport across Central London, which is going to be financially unattainable.
If a high-speed HS2-HS1 connection is built, then you have your east-west high speed line.
Current HS2 plans unfortunately do not include this link (rather, just a low speed connection via the existing North London line) but it is not financially unattainable at all. This would almost certainly happen as part of a hub airport plan.