What is the fine-grained topic of the following text: Something that I did not appreciate at the time was that Billy Walsh drove down to Crawley, South London via the A1 and North Circular road on the Friday in an old banger with me as a passenger, rode around 435 miles in the race, collected me after I had finished, returning to the digs, and then drove all the way back to Doncaster on the Monday. Only return the topic.
Billy Walsh's long journey for a race