@Kay1980
So unfortunate, and so stressful!
The others' comments are things I agree with. @Helen3 @Shelley159 @Mike-And-Jane0
Good advice from good people.
If you get with a solicitor, some terms may be changed a bit, maybe not. I'd predict that a "Holiday Let" is your business, and "Airbnb" is the booking platform. A solicitor may investigate any business limitations of the easement, take you out of the discussion, thus easing any escalating tensions with the neighbor, and facilitating negotiations to a peaceful and mutually agreeable solution. You and the neighbor need to have peace. Stress between neighbors doesn't serve anyone.
Best of luck, and please give us all an update.