233 Tennent Street, Belfast in 1941 - Laughlin, Mrs R - this name continues to at least 1969.
In 1935 - Laughlin, D Coach Painter.
It is possible that John Finlay was a lodger in which case he would not be named in the street directories.
John / J Finlay listed in 1941 alphabetical section (note does not always include all names)
Finlay John agent 56 Wellinngton Place
Finlay John building inspector 65 Lomond Avenue
Finlay John G joiner 22 Glenside Parade
Finlay John M 8 Windsor Park
Finlay J ins agent 10 Whitewell Parade
Finlay J prov merchant 45 Glenbank Drive
Finlay J 33 Osborne Park
Finlay J B violinist 64 Divis Dve
Finlay J F clerk 282 Woodstock Road
Finlay J H The Orchard Knock Road
Finlay J W F accountant 183 Cedar Ave
Hope this helps