Ask an Property Solicitor. Get an Answer ASAP.
Let me see if I can help. The legal test in the case of alleged obstructions, put simply, is: "can the right of way be substantially and practically exercised as conveniently as before?" The answer in most cases is that a single unlocked gate will not normally be held to be a substantial interference; however where there is a lock and you have not been allowed a key to the lock then I think that most courts would consider this to be a substantial interference. Either the lock goes or you are entitled to a key. I would suggest that you could get a solicitor to write such a letter to your neighbour easily enough (it might be covered in your house insurance) for about £100 plus VAT. Happy to discuss and please rate positive with 5 stars for my time.
Hello I see that you have looked at the answer. Could you please let me know if it has answered your original question? You can either reply on here with a quick ‘Yes, thanks’, or select 3, 4 or 5 stars on this page.This is how Justanswer works. I can still answer follow up questions if needed to clarify anything for you. Many thanks