There's a detailed article from the British Agricultural History Society here: https://bahs.org.uk/AGHR/ARTICLES/51n1a5.pdf
Sorry, can't help with locating a copy of the book.
The 1st August 1789 edition of the Sheffield Register had an advert placed by the auctioneer on behalf of "Kinsey Winnell, Gardener, in Scotland ftreet, Sheffield" for three messuages at Brightside, one of which was a public house, together with the Cutlers shops, stable and other appurtnances "in the feveral Occupations of George Milner, Mark Bottom, and Joseph Darwin". The sale to take place at the New Inn at Bridgehouses.
Jackson Collection. The collection was made by three generations of Sheffield surgeons, the last of whom was Arthur Jackson (d. 1914). It includes many papers of the Sheffield genealogist, William Swift (d.1874),
Reference JC/16/2
The Winnell family is certainly listed in this collection.
Tracing the history of a house
Tracing people who owned land or property before 1970
Getting certified copies of pre 1970 deeds for legal purposes
The Registry of Deeds can be used for legal purposes or for family and local history.
"but I'd like to get a copy of this book "A History of Allotments in Sheffield" by Margaret Boulton however it seems to be unavailable."
Amazon claim to have it for about £40.