I see that Jno. Nixon at #80 in the 1885 listing. He's gone by 1891 .... dont have anything in between at the moment :
1891 - Dorset Street, Upper
78 Tenements
79 Mrs. O'Moore, Mrs bootmaker
80 Bernard McDonald, grocer & wine merchant
[Eccles Lane]
same listing in 1894.
Working back in time, John Nixon is at #80 in 1879. Skipping back to 1872 shows a Joseph Nixon, a 'grocer &c' at that address - maybe his father ?
In 1868 the address is listed as 'John Scarlett, grocer &c'
S.