Dont buy branded then .....
You want branded youll have to pay ... Btw 115 quid a tire is pretty good for a reasonably large , heavy weight rated tire.
I put 50 quid a corner non recognised brand tires on my 14 inch wheeled van , but due to pay load restrictions so says the manual. i dont need the heavy duties
I put 60 quid. Corner remoulds on my jeep as typically they get damaged from trail debris not worn out.
Given that some bfg ats for my jeep would be 160 quid a corner and some conti van contacts for my van would be 85 a corner ... I dont think 115 for a conti is so bad , and at the end of the day its part of the running cost of your vehicle, will have to save up for s bit , on the plus side van tires tend to last longer so should be another 50- 70 k before you replace em again