I worked in Central London for more than 30 years and know it extremely well.
I commuted into one of the Southern termini (my arrival point depended on what trains were running that day!). I had to make my way across London to the north of the Central zone and usually went by tube. Tube strike days were very amusing. I usually made my onward journey by a mixture of Shank’s Pony and buses. Many people who regularly used the tube obviously had no idea whatsoever where they were when forced to travel on the surface. Many a time I had been heading north up Whitehall to Trafalgar Square only to be confronted by a distressed commuter heading south who had arrived at Charing Cross, asking me how much further it was to Oxford Street!
“My daughter had to walk from Kings Cross to New Barnet. “
Er..why. She could have got a Great Northern suburban train. They run about every 20 minutes or so. New Barnet station is about halfway between the two tube stations at High Barnet and Cockfosters.