After the game Richardson spoke to Scottish Rugby about what the occasion meant to him.
"I was thinking all the people who've who've been behind me all the way through my career and how grateful I am for everything they've done for me and how I just wanted to make sure that when I got my opportunity, I could share that gratitude through the way that I expressed myself on the pitch, the way I performed.
"And I hope I've done them proud. I'm trying not to cry as soon as the game was over, just because I was just a bit overwhelmed about how grateful I felt and what comes next."
You can watch the full interview below...