Given a significant part of the journey to Margate is still on conventional lines, how much did the journey time descrease? Looks to only be about 15 minutes compared to the Chatham main line
It’s about 20 mins (18%) quicker, and much more if your destination is somewhere more easily accessed from St Pancras or Stratford, eg the City, Canary Wharf, and most of the north side of central London.