Night Latches
Search volumes:-
night latch (1,800)
night latch lock (900)
nightlatch (800)
interestingly G this one hmm maybe specific cat required not sure
Yale night latch (1,300)
top sites:-
https://www.screwfix.com/c/security-ironmongery/night-latches/cat810294
https://ironmongeryexperts.co.uk/locks-latches/night-latches.html
