I am erecting a new boundary fence & wish to retain a gateway (has been there since original fence) as an emergency exit. Adjoining owner says "no, cut the fence if and when necessary". I am elderly, widowed, live alone & a pensioner. If my current entrance becomes inaccessible, I have no other way out or for emergency vehicles to enter my property should the need arise in an emergency situation. I have offered to pay in full for a new gate to replace the current one - do I have the right under property law to do this seeing that the gate exit has been there for the past 50 yrs?