There are 2 books in the The Postman series. The newest book is Running Towards the Light which came out in 2014.

This is the story of my 35,000 kilometres ride from Sydney to London on a 105cc Honda called Dorothy. It was journey of nine months, through eighteen countries, with barely any planning, hardly equipment, just setting off one day and hoping that somehow I'd make it to the other side…
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Running Towards the Light

Book cover of Running Towards the Light
Having ridden from Sydney to London on a 105cc Australian Post bike named Dorothy, this is the story of the subsequent trip across America and up to Alaska. Camping wild, taking the back roads and doing it on a shoestring, this is a story about getting back on the bike…