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I am Al and am happy to assist you with your enquiry.
Who owns the driveway? Does he wish you to change which section of the driveway you use?
Afraid it doesn't mean you both own it- it just means both of you have rights of way over it- normally, each neighbour would own half each, or one owner owns the whole driveway.
Do you have your Land Registry plan to show if the driveway is in your ownership?
You can apply online for a copy of yourTitle and Plan on the Land Registry website, for a nominal fee.
If it turns out he owns the driveway, there will be little you can do.
If you own it, or a part of it, then you need to have a look at your neighbour's deeds to see what rights have been granted to him, but it very doubtful that he will be able to "change the goalposts".