Shed,
Where are you getting your figure of £10bn+ from? Have you read the latest consultation or are you just cherry picking whatever suits you agenda.
Ah yes. You never quite grasp this bit. Public funds spent on support infrastructure to make LHR R3 work cannot be simultaneously allocated to other projects. The money is gone.
The government has already made millions from this project and continues to do so. Every part of the consultation, design and construction is liable for a variety of taxation.
So now tell us shed, what exactly are these projects you are so sure provide such a sound business case over and abover LHR? Are they struggling to get investment purely because it is all being spent in the SE?