Kite159
Veteran Member
I don’t think you need to worry about the 15 minutes minimum change on a season ticket, in practice there are trains Waterloo-Vauxhall every 2-3 minutes from platforms 1-5 (sometimes 6) and trains about every 4-8 minutes from platforms 16+
For some platforms you can walk between buffers and barriers (which works best depends on which platform mainline train uses, as shops on former carriage road break the route, unless you go around back of shops), and during peak can also do down the stairs near second carriage to W&C mid concourse and up to another platform (more like 2-4 minutes to change once you know layout)
However if you don’t pass any barriers at Waterloo doing this, not sure if delay repay will calculate automatically as it will have to guess your trains and changes.
And during the peaks, when the subway is open, it's easy enough to change platforms without going out of the barriers to the main concourse.