Generally, in such matters, it is best to negotiate directly with neighbours rather than be confrontational. I understand this is only possible if the personalities involved are willing to reach an amicable solution.
You may wish to consider collecting evidance such as photos. I also suggest you send him a letter before making a complaint (see template below).
If that is not possible, your next option would be to make a court application to force him to move rectify the situation subject to having sufficient evidence. This application is called injunction.
To apply for an injunction, you need to complete form N208 claim form to start court proceedings and the application for an injunction N16a form and send them to your county court with a fee of £322 payable to HMCTS. (both forms are attached)
You will need to write a supporting statement detailing the history of the issues with the neighbour and provide evidence.
You can use this template:
As you know, we have had a dispute over [brief summary - eg use of the shared driveway]. Whilst we disagree over this matter, we are neighbours and so do need to try to resolve this issue. I think that [a more formal meeting to clear the air / professional help from a mediator] may be the best way forward.
I/We don’t wish to prevent you from enjoying your home but you may not realise the effect it is having on us and I/we have reached a point where I/we felt it was necessary to mention it, in the hope of resolving the matter informally.
I am /We are happy to talk with you so that we can come to an amicable arrangement.
Please can you confirm that you are willing to [meet up / attend mediation]
Please note if we cannot agree on an amicable solution i will have no choice by to ally for an injunction.
Thank you for your time.