a little bit further down in the comments, Neil Crocker has the full story on the other stowaway:
"Found him lying on the verge about 20km before the Humber Bridge. He spoke no English but I realised his Garmin was repeatedly crashing and he had no backup. Beckoned him to follow me to next control. At first he kept up with me but soon I was stopping frequently for him and by the time we crossed the Humber Bridge he was barely moving.
He looked really unwell but not ill enough to call 999. I went to the Visitor Information Centre for help and the lady there was phoning around for translation services and making tea for him. A passing nurse in full motorcycle leathers was also trying to ascertain what was wrong with him. He then fell asleep under the shade of a tree and I was concerned that if I left him his bike might not be there when he woke up. (While he was sleeping I did manage to re-start his Garmin and find the route.)
I rang Danial and agreed I would take him to a hotel to let him recover. With more help from the VIC, and a trip to Hessle Co-op to get the food he insisted on, I finally got him to the local Premier Inn but they could not book him in because he had no formal ID. However I did find out his name from the credit card he had.
So I rang Danial who then informed me there was no one of his name on the ride! It had never occurred to me that he might not be an official entrant. By now he was beginning to perk up a bit so I reluctantly left him to fend for himself and set off for Pocklington. I do wonder what the full story was and what became of him."