Bit of a random question, but how long does it take to fast walk from St Pancras mainline platforms to King's Cross UG station? I believe the walk between the 2 is all underground?
Yep at least five minutes since the refurb. In order to cope with increased volumes of people the revised layout involves a lot more walking between stations when using the deep level lines.
You're spot-on! I timed it yesterday evening at around 6:30pm and it took exactly 7 mins from the time I stepped-off the tube to the time I reached the EMT platforms at St Pancras.