This looks like it might be him.
Thats a good find Isobel - I have to say I did wonder if that was a possibility he would have been born after his sister Barbara 
we have a birth registration for his sister Barbara born 1st April 1884 linlithgow dalmeny  
If this is the correct death entry the dob matches the baptism record you have posted
George Sinclair Hall Death Age:   84
Birth Date:   
3 Mar 1886Jun 1970 Manchester Lancashire
Volume:   10e Page:   131
Edit ~ 
Sharl10Did your George marry  Alice F Whaite in 1915?
From Lancashire BMD
HALL   George Sinclair   
WHAITE   Alice Florence   
1915 Chorlton-on-Medlock Register Office or Registrar Attended
Did they have a son born Sep qtr.1918?
Hall    John A    mmn Whait    Chorlton    8c   1180
Do you have the family on the 1891 census?
Can you give more details of George Hall & Elizabeth nee Sinclair's dau Barbara's 1884 birth/baptism
What was her father George's occupation?
When/Where did George Hall die as Elizabeth is a widow on 1901 census