1) To relieve the pressure on Waterloo and Victoria at peak times.

2) To facilitate easier travel between the City and destinations served via Clapham Junction.

You seem to have overlooked the fact that many, perhaps most, of the travellers who alight at Victoria and Waterloo do not want to be at those places anymore than people wish to be at Clapham Junction. Consequently huge numbers of passengers try, not always successfully, to access the Underground at those two stations.

TfL is now spending an astronomical sum to expand the capacity of Victoria Underground Station to cope with peak demand that lasts . . . how long? Two, perhaps three hours a day? Five days a week? About forty-five weeks a year? And did not TfL spend a large amount of money on Victoria a few years ago?

Incidentally there are many who would disagree with your assessment of that part of Battersea.