The earlier replies are really useful to know, but if you’ve been having difficulties with your neighbours, I can see you would want to resolve the issues, even if that means there is something to disclose if one of you sells up. There’s probably nothing to stop you taking legal advice so you know what your options are.
However, it could also be worth exploring mediation, as this is a non-confrontational way to find a solution everyone can live with. I’m a mediator and I also provide free mediation through my local Mediation Service - most local areas have one, including Wandsworth (http://wandsworthmediation.co.uk
) (I’m not a Wandsworth mediator). All the mediators will have lots of experience of property disputes from boundary issues to noise, parking and so on. Your neighbours would need to agree to participate (if they won’t, you can ask for ‘conflict coaching’ to help you manage any disputes). These free mediation services are completely independent and run by volunteers (a charity, nothing to do with the local council) and they normally just ask you to consider making a donation to help keep the service running, if you’re in a position to afford something.
I would be interested to know from the property/legal experts whether using a mediation service is something you have to disclose if you sell, but it’s certainly a lot less stressful than getting into prolonged legal arguments (and likely to be quick). I wish you luck finding a solution to the current difficulties.