I claimed a couple of years back, buckled an alloy in 2 places and blew up tyre on an astravan.
I wanted the tyre tread to be the same either side so I claimed for a new alloy and two new tyres for the front, totaling £300 they didn't even quibble about the other tyre.
Take photos of the damage, the pothole, depth, location and get receipts for repair. If the pothole has white lines around you will win without dispute as it has been acknowledged but not repaired. If there are no white lines you can request reviews of that road from the council under the freedom of information act as stated on watchdog the other week and if the pothole was acknowledged in the road review but not repaired then again you win.
If neither of the above apply you it becomes a little more complicated for them to admit liability and you could stand to lose, you could report it first then claim but not sure if they would contest dates etc, Usually their rule is if they weren't aware of it previous to the complaint then they won't accept liability for the damage.
On your council website you should get the details for the local highway company.
Best thing to do is be persistent, I hope you get it sorted!