Each Council ,has a different criteria, There is No industry limit.. so check to save you a load of letterwriting.
As above. you will need to check out what your council Criteria's are...
you do need before you present your evidence is to take a photo of a tape measure measurement of the offending hole, I did it and won.
I first went back, photo of tyre and remaining tread, against the hole in question, i also laid a tape measure over the hole showing dimensions of the hole and finally your contact details etc.
The hole which burst my tyre was 6 inches deep by 12.3 inches wide etc etc, and had a shrp edge, the clain took 3 weeks.
Good Luck!!