From Ebbsfleet International train to St Pancras International. 19 min £13. From Grays train to Barking Underground Station, Tube to King's Cross St. Pancras Underground Station, then Tube to Camden Town Underground Station. 1 h 4 min £10. From Grays taxi to Camden Town. 41 min £105. From Grays drive to Camden Town. 41 min £4.