Listen to MummyBarrow... she knows her stuff, I used to work with her! What she doesn't know about houses/LL/tenants is NOT worth knowing.
GOOGLE her... that will be all the proof you need!
the bit of the business I used to be in was Inventories.
Your comment The driveway condition wasn't on the inventory is significant, if the drive is not even mentioned then the LL can't prove it was good clean condition. So even if you had dug it up and planted moss and wild flowers there is not a thing he could do wrt your deposit.
If the driveway is mentioned, but no condition stated, sometimes that can be (small print somewhere) assumed to be in good clean condition. Check for that small print, if it's not there, you are in the clear.
NOW, you know you damaged the drive, HE knows you damaged the drive, but ONLY a portion of it. THAT is the only cost you would EVER legally be held accountable to. If the LL chooses to re-tarmac the entire drive as a result of a proportionately small area, that is HIS decision. You could offer a contribution towards his retarmacing the drive and that would be MORE than you would ever be legally held to do.
Offer what you think is far, MummyBarrow's £100 is fair, and tell him that that is the full extent of your offer and if he wants any more, indeed TDS or court is the only option (he WILL lose, no question of it)
Please don't faff about getting people in, the repair is not your responsibility, you know that the LL will never be happy with the repair, it will have to be re-done and you will be told you are responsible, it will haunt you for WEEKS at the minimum.
Get the repair company details, give them to him, and offer him £100. NO MORE.
You will have to do to TDS to get your deposit, as I'm sure he'd raise a dispute, but don't worry, if your inventory is as I suspect, you have NOTHING to worry about, and you wouldn't get ANY deduction for the driveway taken from your deposit.
Let me know if you have any more info on your inventory.