Good luck in getting a repair, I doubt anyone will do it as its in the side 1/4 of the treat which is the area they are not meant to repair it.
I would say take it into a shop and see if they can repair otherwise replace it (or just remove it if its not deep enought to pierce the tyre)
Better that way than saying "I'll sort it next week" like we did with my girlfriends then it went on the M25, luckly the runflats came to the rescue