I don't think they'll get any joy on that front - Martin stood over it for a while, then moved away and Harriman stood over it, at which point the ref waved a yellow. I don't think any argument about mistaken identity will hold up because while Harriman was the one standing over it at the time, it was Martin who had stood there for a while and done nothing, so the ref will say it's for the first offence, I guess.
In that case, the Ref should have booked both players. The guy who is going to take the free-kick - Harriman was the one I thought was always going to take the free-kick. So the ref books Martin! Unless the Club contests successfully the decision a few on here will have kittens if Martin is not punished. Will also make Mysterious Curle smart arse comments superfluous