Bushby’s mother, Angela Bushby, later wrote to Bier thanking him for the donation towards the cost of his global adventure.
And last Christmas, Bushby – who rests up in Mexico between three-month stints on the road – rang Bier to tell him the postcode was close to being delivered.
“We laughed,” said Bier. “It was a funny event. That postcard has travelled a long way and been on a lot of adventures with Karl. It will be the world’s slowest postcard to be delivered. It’s amazing.”
After so long travelling, Bushby admitted he is now “tired, for sure” and is looking forward to returning home, but admitted: “It’ll be the end of my life as I know it.”
Bushby, now 56, said he intends to release a second book charting his journey and sees himself working in “science education” when he returns.
Bier said: “It is clear from speaking with Karl that it more than a walk. It is his life.”