After 20 years of exercising a right such as access or right-of-way or parking, then you can claim the right to continue to do so as an easement under the Prescription Act.
The 20 year period applies collectively by adding together your use and any previous use.
You would need to get the easement registered against the deeds of the land or registered as a land charge if the property is unregistered.
Once you have the easement to park, you can then take the other neighbour to task over obstructing your vehicle.
Even before you have the easement to park, you have a claim against the neighbour in private nuisance if he is doing this and it is quite simply a nuisance whereby you have to ask him to move his car every time you want to move.
As it is at present, there is nothing to stop him parking in this space.
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The easiest way of printing the page in front of you is to press Ctrl P.
Then, select all the text and then paste into a Word type document and print in the normal way.
You apply to the Land Charges department to register a class Diii Land Charge against the property and the restriction against first registration so if anybody does try to register the land, you can raise the issue of your land charge.
If you don’t have experience of this, you will be well advised to get a solicitor to deal with it for you.