G'Day again Pilgrim,
Dealing in spirits (strong liquors) had just become a hot line of business in 1830. Your John Wilson may have jumped on the bandwagon!
A new Whig (Liberal) government had just taken power with a very strong mandate from the electorate, fed up with the previous Tory (Conservative)administration.
It introduced much radical legislation to address pressing economic and social problems.
Gin had been invented in Holland as a linament to ease the pain of the skin sores that plagued marching soldiers during the Napoleonic wars. As it contained strong alcohol the soldiers naturally took to applying it internally, despite its unpalatable taste (neat)! They brought their liking for imbibing it when they returned back home after 1815. The end of the war also caused a drop in demand for many products, with linen goods (one of the mainstays of Ulster's wealth)particularly badly hit. Much poverty ensued.
The habit spread to other family members, with mothers and children becoming regular drinkers.
[The drink became known pejoratively as "Mother's Ruin".]
As a result huge quantities of cheap gin flooded in to the country, creating a huge balance of payments problem for the Exchequer.
The new government's solution was to encourage the production and sale of locally produced alcohols, for local consumption and for export, like whiskey and beer. Tax was taken off the latter for 50 years! Points of Sale were boosted by reducing the cost of grocer licences, and of spirit licences - pay 2 guineas and you could start serving from your front room!
[This why many old pubs date from around this time, and frequently have a small "just like home" room or nook.]
The scheme took off rather too successfully, and had to be reined in by further legislation in 1832 - when retailers had to decide to become off-licences (hole in the wall vendors) or publicans (hosts). Limits on opening hours and content strengths/measures were strictly imposed/monitored.
[Some of the OS Memoirs of the time illustrate the effect well, with villages containing e.g. 1 baker, 2 butchers, 1 blacksmith, 7 spirit retailers ...]
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There are some interesting potential leads for you in the 1843 Belfast Directory
http://www.lennonwylie.co.uk/alphanames1843N2Y.htm among which are:
Wilson, Guy Stone,
Rectifying Distillery, 11 Mill Street, residence, 25 Chichester Street.
Wilson, James, Wholesale and Retail Grocer, Tea and
Wine Dealer & Aerated Water Manufacturer, 27 Church Lane.
Wilson, Robert, Publican, Lower Malone.
Wilson, Robert, Ship Master, 9 Earl Street.
Wilson, Mrs. Mary, Grocer,
Spirit Dealer, etc., 2 Great Edward Street.
Wilson, Thomas, Grocer, 36 Trafalgar Street.
Wilson, John, Publican, Falls Road.
Wilson, Denis, Publican, New Antrim Road.
Wilson, John, Grocer, Baker & Forage Contractor, 77 North Queen Street.
Wilson, John, Publican, 89 North Queen Street.
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More soon ...
Capt. Jock