On 2013\09\16 00:12, Recliner wrote:

Regarding the cost, I wonder if the property developers of the northern
Kings Cross area would be prepared to make a hefty contribution?

I don't. Getting developers to fund new platforms as a condition for
planning permission is hard enough, getting them to realign a railway as
an afterthought is not going to happen.

We're still waiting for the Central Line platforms at Park Royal!