Can you explain more about the access you require? Is there no other access available?
Sadly, you cannot force the neighbour to grant access. The only option you have is to negotiate. Maybe the neighbour has a price. It usually comes down to money.
Thanks for the plans and extra info.
As to the amount you would have to pay, you are landlocked and you could equate the neighbour's land to a ranson strip. There is no rule of thumb really to determine a fair price to buy access. You are totally in the hands of the neighbour as to what price they will accept, if they will accept anything at all. The fact the land has no other access, and if the neighbour knows this, makes their access route more expensive, a ransom strip.
On some of the back garden developments I have worked on the land which give access always sells for much more than the rest of the plots. I have know developers walk away from potentially good sites because the access was to expensive to acquire eating into the profit margin. I know you are not developing to sell but I am trying to make the point you are very much in your neighbour's hands.
Any further questions or queries.
Unfortunately it is the only option.
The site works by you accepting my answer. Please can I ask to to take a moment to do this, thanks. Any questions or queries in future, please do contact me. Good luck.
Thanks John. Please can you click accept/rate via the website. Thanks