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It is a bit confusing, the electoral roll from 1950 in Ancestry UK says Street address: 747 Williams, Ward: Sparkbrook and when I click on it to see the detail it says Belgrave Square and against the person's name it says 16 and then Belgrave Road continued. At the top it says "Borough of Birmingham - Sparkbrook Constituency - Polling Dist ABJ (No 733) Deritend Ward"
[I think that they moved to Stratford Place and then Shawbury Grove].
The other address says 144 Victoria Grove until I click on it then it says 144 Belgrave Road. At the top it says index Belgrave Road (North side between Bristrol St and River Rea) Benacre Street
On Ancestry you often find transcripts are wrong. Go with the actual electoral roll. Also the first number you see is probably the electoral number not the house number.
If I remember correctly it would look like:
747 Burns J 144
so the 144 is the house number- the road would be somewhere else on the page.
The entry is:
746 and 747 are the electoral (voting numbers) for Violet and Raymond. The address is 6 back of 164 Belgrave Road. I am not sure where you saw a 16.
Belgrave Square is a small section of Belgrave Road.
This map shows 164 and the court behind it: the road running top to bottom is Longmore Street and Belgrave Road goes left to right.