Hi Austino
I would still suggest trying to come to some sort of rapprochment with these unfortunate neighbours of yours.
I think it's important to remember that we do not own our land absolutely. What we effectively own is extra 'rights' over 'our' land above and beyond those of the general public. These rights are subject to change at any time.
Before the Town and Country Planning Act of 1947 you could build on land that you owned without having to get permmision from anyone - you just needed to prove you owned the land. That 'right' of ownership was removed.
There was a time when you didn't need a felling license from the Forestry commision before you could fell your trees. There was a time when you could grub out the trees from your wood and convert the land to pasture without needing permmision. Those were both 'rights' of ownership which have been removed.
For Hill Farmers - there was a time when the general public had to stick to Public Footpaths but the CROW act (Right to Roam) changed that, and now people can walk wherever they like on it. Those farmers 'rights' of ownership changed with no compensation in return.
There was talk at the time of the CROW act of including woodland in the 'Right to Roam' areas - this was dropped then. However since the farce of the recent, now dropped, proposal to sell of the Forestry commissions woods public access to woodland has come back on the agenda. It's a relatively cheap thing for a government to do. It 'gives' the public a big 'gift' of access at very little expense to the exchequer- it would be a popular decision with the overwhelming majority of the population.
I wouldn't bet against woodland owners losing the 'right' to exclude people from there woods within the next 10 years.
All our 'rights' of ownership are relative and subject to change (even very dramatic change) - as I say we are not absolute owners of our little kingdoms. We only 'own' them as a series of rights within the context of our society.
The history of land ownership in the U.K. has been one of a continuous loss of rights. I don't think anyone can argue that it's all been bad - There was a time when you could deter tresspassers with Man Traps and Rock Salt shotgun cartridges.
For what it's worth I think that a general 'Right to Roam' in woodland would be a terrible step from a conservation point of view, but I think you need to keep in mind the possiblilty that your neighbours might be handed the right of access to 'your' woodland at some point in the future - how might they act then after years of exclusion and unpleasantness? I would avoid making any threats to them and see if there is any compromise you can make.
Bad relationships with neighbours can spoil so much of the potential pleasure of woodland ownership. How much of the time when you're at your woods are you thinking of these neighbours and this stressful/annoying situation, rather than really enjoying yourself and being at peace there? Try and go for compromise not threats if you possibly can - would it really be that bad if they walked in the woods when you weren't there?...But if that fails remember you can always murder them and bury their bodies deep in the woods!