I've put together a chronology of beer retailers and public houses in Walcott. Most items are from directories as noted. Items in square brackets are newspaper mentions. Two things to note:
(1) It seems likely that the Black Horse became the Wilson Arms: see 1872-1876-1885-1889 although 1872-1876-1885 is confusing. If so, Moses Creasey was not at the Black Horse/Wilsons Arms.
(2) 1889-1890 indicates that Mr Mountain's beerhouse was/became the Plough Inn.
Did beerhouses persist with change of ownership? In other words, since Thomas Mountain (1889) 'replaces' John Bellamy (1885) can we assume that this was a single premises, so that John Bellamy was in the premises that came to be known as the Plough Inn?
And does the news item from 1890 suggest that a brewery moved in to Walcott, bought a beerhouse, and named it the Plough Inn?
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[1830 Henry Coupland of the Black Horse Inn, Walcot]
[1834 Robert Parker of the Black Horse Inn, Walcot]
1861, Post Office DirectoryAbraham Black, beer retailer
Abraham Black jr., beer retailer
Crosha Bralsford sen., beer retailer & shopkeeper
Moses Creasey, beer retailer
Miss Sarah Parker, Black Horse
1868, Kelly's Directory Moses Creasey, beer retailer
Thomas Parker, Black Horse
William Sleaford, beer retailer & carrier
1872, WhitesMoses Creasey, beerhouse
William Parker, farmer and victualler, Black Horse
William Sleaford, beerhouse & carrier
William Tong, farmer & beerhouse, Dales
[1876 Willson Arms Inn transferred from John Parker to William Catton]
[1880 Moses Creasey dies]
1885, KellysJohn Bellamy, beer retailer
William Catton, Black Horse PH
John Morris, beer retailer
[1885 Jacob Prior, Wilson Arms]
1889, KellysJohn Morris, beer retailer
Thomas Mountain, beer retailer
Jacob Prior, Wilson's Arms PH
21 June 1890, Grantham Journal
Mr Jessop applied for a new license for the Plough Inn, Walcot, the property of the Lincoln & Burton Brewery Co. the late tenant, a man named Mountain, having either lost of destroyed the original license. – Granted.
1896, Kellys William Brooks, beer retailer & shoemaker
John Morris, beer retailer
Jacob Prior, Wilson's Arms PH