In Devon, i would guess we have the most potholes. In my road, they have marked out another area of hole filling but they only do the minimum amount leaving some still in place. It gets a repair every 2 years. This is just a small road for houses and not through traffic. The problem here is the large number of delivery vans and food deliveries using the road as a short cut.
The main road to Exeter is covered in large craters and some attempts are made to fill a few but again, these are just tarmac tipped in and raised so traffic forces it down. These repairs last about 4 weeks before all the new tarmac lifts. Its like driving a slalom to get out of town now and as cars swerve around the holes, new holes form. Meanwhile, the water leak outside my house has forced the road surface up and cars now get scraped as they drive over it. It has leaked since 2002 yet the Water company comes and draws a blue ring around it every 5 years but never attempt repairs. Plants now grow beside it as they get well fed. The mud and tarmac mound is now 9 inches high so car front spoilers get hit and the floor pans scrape.