The new Doncaster platform!
Ravenglass' platforms are a bit apart, as are the ones at Sturry.
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WINNER: Inverness platform 7. You have to walk across a car park...
Platform 1 to platform 14 at Paddington is an hefty hike.
Liverpool South Parkway from platforms 1-4 to 5 & 6.
Victoria 1-> 19 is 330m.
http://www.gmap-pedometer.com/?r=7005199
(Note: you can't run the diagonal because there's retail in the way)