Sussex Family History Group's transcription of the baptisms and burials of Reuben's children at St Nicholas Church suggest he was always in the area, but took a while to become a butcher.
Reuben married Eliza Selden at St Nicholas in 1834
Eliza Elizabeth 1836 dtr of Reuben the Shoemaker of Regent Hill
Joseph 1838 (On IGI but no baptism found on SFHG. Death address was Victoria Street) died 1845
Sarah Ann 1839 dtr of Reuben the Shoemaker of Victoria STREET
Reuben 1841 son of Reuben the Shoemaker of Victoria STREET
Frank 1842 son of Reuben the Shoemaker of Victoria STREET
Sylvia 1844 dtr of Reuben the Shoemaker of Victoria STREET (Died 1845)
Mary Martha 1846 dtr of Reuban now a Laundry man of Victoria Street
Caroline 1849 dtr of Reuben the Laundry man of 27 Victoria Street (Died 1854)
Frederick 1850 son of Reuben the Laundry man but of Victoria ROAD (Died 1853)
George 1853 son of Reuban now a Green Grocer of Victoria Road.
(I have ommitted the actual baptism and burial dates in the hope you will consider membership of SFHG)
Victoria Street and Victoria Road intersect at the building you have featured.
I may be wrong (an early street directory may prove that to be so) but in my opinion, the corner property you have featured has certain characteristics not of a shop, but of a former public house, with number 7 (round the corner) adjoining it. Perhaps another Rootschatter could check that out?
Roy G