Just a line to let you know that I am alright. We have left Marseilles after having three days their. We were allowed out. its a fine big city and you meet all sorts of people. At present I am in Calais and hope to be in England by Thursday at Ripon if good luck. Hope to be seeing you soon. With love Harry
Nearly home! I would think that a train from Marseilles, retracing the route he took in November 1917, is the most likely method of travel. 3 days in Marseilles, 24 hours in the troop train - that about accounts for all the time. I wonder what "all sorts of people " encompasses.
The YMCA have put their own postmark on the card. Harry must have stayed in Hut 2 in Calais.
Ripon is in Yorkshire, not too far from Jack's home. 6th January would have been a Tuesday in 1920 so, if he thinks he'll be in Ripon by Thursday, things will have to move quickly.