UK Land law

Andy inherited a registered freehold in 2013, a 4 story townhouse, but felt it too large for him to live alone . thus, he decided to live on the ground floor and earn money. now he wishes to sell the property.

Andy has a key to the entire property but has ensured that he also has a copy of the keys for each floor's separate entryway. He is a keen animal lover and has encouraged the others to have pets if they so wish. He occasionally uses his key to put out water and food for the pets and to take Ben's (a friend who lives in the townhouse on rent) dog for a walk.

Does this make a difference in the interest of the other residence? can it impact the sale?

(what interest does he have, will the new buyer be bounded by bens agreement, is the agreement a lease or licence? use relevant law and cases)