Drove thru yesterday (as promised in my pm).
I didn't get lucky and spot a name.
Aldenham Road was (always is) too busy to drive down whilst spotting for a possible house name. There are a number of building projects ongoing and, as can be expected, a number of properties are more recent than 1950.
Here's a link to the house next door to your relative before he moved to Aldenham Road. He lived the dwelling next door to "St.Julians" (right-hand property). I don't think the 2 houses in the pic are 100+ years old, but the 2 next to them ([part-]terrace) certainly look the part.
Small problemette with g-st-view . . . . .
http://www.rootschat.com/links/0mn9/ worked yesterday, not today.
Search for Vernon Road Bushey.
StJulians is LHS, 5 houses up from Junction with BeechcroftRd.
Ray