Tiger had been travelling around Thailand with his best friend “for his birthday, which is today”, his father said.
“They’d just been to the gym, they’d gone for lunch and Tiger was overtaking a car.
“As he was overtaking a car, another bike – because it’s crazy out here – flew across the road, it threw him from the bike,” he added.
When emergency services attended the scene they spent 16 minutes resuscitating Tiger, before taking him to a hospital in Koh Samui.
“His poor friend has been there [at the hospital] every day,” Kieron Duggan said.
Tiger was transported to the hospital in Bangkok on Friday, to receive specialist treatment and was accompanied by his mother, Lisa Duggan, a neonatal nurse at Milton Keynes University Hospital, and his aunt.
The family said that they have spent more than £40,000 on medical fees and flights.
Tiger’s mother said her colleagues had organised a fundraising appeal and the donations have helped the family.
“It’s such a great feeling, to see people raising money for Tiger,” Kieron said. “People are praying for us.”