But not even Hamilton’s family were given the courtesy of knowing about the headline-making move until the very last moment, he revealed to BBC’s Back At Base podcast.
"I didn't speak to anybody,” he said. “I didn't tell my parents till the day of it being announced. So, no one knew.
"I really wanted to do it for myself. Ultimately, I had to find out what would be the best for me."
Hamilton has 24 races with Mercedes before he dons the red colours for the first time in a quest to achieve what he described as his 'childhood dream'.