Basically, the tube is going to be diverted to a private development, maintained for years to come using public money. The developers will contribute to the inital cost of building the extension, but then effectively receive an huge ongoing subsidy in perpetuity. The develppment at Nine Elms is only 10 minutes walk from Vauxhall underground, but clearly there is desperate need for another station even closer. It seems to me that a publically funded and maintained transport network shouldn't decide strategy according to which developer offers the highest one off payment, but rather actual transport need. The developer will have done their sums. They're not providing a public service here. TFL should be.