I have a fairly new set of Nobby Nic tubeless tyres and on a ride the other day i scuffed the side wall of the front. It now has a leak from the very small area of damage that seals and then unseals.

Best course of action?

1) stick a puncture repair patch on the outside
2) stick a puncture repair patch on the inside
3) buy a new tyre.

if it helps the scuff is approx 5mm in size and the leak is 1mm. If placing a patch on the tyre is the way forward, what do you suggest for making sure the tyre is clean for the patch to hold best

I patched a Continental UST on the inside with a normal patch. Had no issues.