I have a quite similar puncture few weeks ago and it could be repaired.Is that not repairable ? It doesn't look to be too near to the edge of the tyre or sidewall but the pic doesn't show the whole tyre.
since the car is a 2014 model, the tyres won't be much older. the cracking is due to running underinflated, ime. and of no consequence if not to the level of the plies.Be interested to hear how old that tyre is, there is some bad cracking in the tread...
(for the OP, there is a four digit date code on every tyre with the week & year, ie 0115 is 1st week of Jan 2015, 5215 would be last week of December 2015)
Can also be caused by over inflation and the tyre stretching, as seen as there is some stress on the tyre tread blocks, say when cornering, it tears the rubber at the bottom of the grooves.I had the cracking issue on Dunlops as well.
I appreciate what CS155 says about underinflation, but I don't think it is the cause in all cases.
I think it is down to manufacturers making compromises to get good results for the EU tyre labels.
Some tyres are made very soft to get good results (Wear isn't measured so it matters little), where as others use compounds which are prone to cracking.