Didn't fancy stopping at Sandy?
I once did off a train at Birmingham Moor Street onto a train at P5 at New Street in seven minutes!
Best I've done recently is 18 minutes between arriving at Liverpool Street and departing Waterloo. I actually made it with a couple of minutes to spare in the end but I did get lucky only having a short wait for a Waterloo & City line train.
Came off the overground at euston, a rather brisk walk over to St Pancras and was on my departing train in just under 10 minutes! That was thanks to Yorkies brilliant shortcut between the two, which I couldn't live without now!
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Shortcut? Do tell...