Question: Don "The Bull" Adams was a bare-knuckle boxer, from Waltham Cross, Hertfordshire, in which UK country, at a planned fight at Holborn Stud Farm on Sunday, 26 October 1975, between himself and Roy “Pretty Boy” Shaw, was an English millionaire, real estate investor, author and businessman from the East End of London who was formerly a criminal and Category A prisoner?

Context paragraphs:
Kunigal stud farm: Kunigal stud farm is a stud farm located in the town of Kunigal in the Indian state of Karnataka.  This farm is used for breeding horses mainly for racing and is the oldest stud farm in India.  The history of this farm can be traced back to the times of Tipu Sultan, the ruler of Srirangapatna who used it to breed horses for his cavalry to fight against the British.

Don Adams (boxer): Don "The Bull" Adams was a bare-knuckle boxer, from Waltham Cross, Hertfordshire, England.  In addition he was known as King of the Gypsies.  At least one of his fights was detected by the authorities.  Hertfordshire Constabulary reported a planned fight at Holborn Stud Farm on Sunday, 26 October 1975, between Don “The Bull” Adams and Roy “Pretty Boy” Shaw, promoted by Adams’ trainer Tom “The Bear” Brown.  Donny Adams's second for the fight was an Ex RAF policeman named Huw Rees.  This fight was banned, but must have taken place later, as Shaw was reported later to have beaten Adams.  Shaw won the bout in the first round.  Before that fight Adams had 48 bare knuckle fights and won them all.

Gary W. Keller: Gary Keller is an American entrepreneur and best-selling author.  He is the founder of Keller Williams Realty International, which is the largest real estate company in the world by agent count.  Keller founded Keller Williams on training and education and later brought his teachings to print.  His books include "The Millionaire Real Estate Agent," "The Real Estate Investor," and "The ONE Thing".  He currently serves as the Chairman of the Board at Keller Williams Realty International.

Stud farm: A stud farm or stud in animal husbandry is an establishment for selective breeding of livestock.  The word "stud" comes from the Old English "stod" meaning "herd of horses, place where horses are kept for breeding".  Historically, documentation of the breedings that occur on a stud farm leads to the development of a stud book.  Male animals made available for breeding to outside female animals are said to be "standing at stud", or at "stud service", referencing the relatively high probability that they are kept at a stud farm.

Waltham Cross: Waltham Cross is a suburban dormitory town 12 miles NNE of central London and located within the metropolitan area of London, the Greater London Urban Area, and the Borough of Broxbourne in Hertfordshire.  It is immediately north of the London Borough of Enfield and is the most southeasterly town of Hertfordshire, located immediately north of the M25 motorway.  The Waltham Cross post town additionally includes the neighbouring town of Cheshunt and a small part of Enfield.

Pretty Boy, Dirty Boy: Pretty Boy, Dirty Boy is the second studio album by Colombian singer Maluma, released on 30 October 2015, by Sony Music Latin.  Work on the album lasted three years, during which Maluma collaborated with various songwriters and producers.  "Pretty Boy, Dirty Boy" is a concept album meant to showcase the different facets of Maluma; the "Pretty Boy" side contains romantic balladry and the "Dirty Boy" consisting of reggaeton-infused seductive songs.  Four singles were released from the album, "El Tiki" and "Borró Cassette" which preceded its release and "El Perdedor" and "Sin Contrato" – all of them were successful in countries across Latin America.  In order to promote the album, Maluma embarked the Pretty Boy, Dirty Boy World Tour in 2016.

Roy Shaw: Royston Henry Shaw (11 March 1936 – 14 July 2012), also known as Roy "Pretty Boy" Shaw, Roy "Mean Machine" Shaw and Roy West, was an English millionaire, real estate investor, author and businessman from the East End of London who was formerly a criminal and Category A prisoner.  During the 1970s–1980s, Shaw was active in the criminal underworld of London and was frequently associated with the Kray twins.  Shaw is best remembered today for his career as a fighter on the unlicensed boxing scene, becoming an arch-rival with Lenny McLean.

Real estate entrepreneur: A real estate entrepreneur or a real estate investor to a lesser extent is someone who actively or passively invests in real estate.  An active investor may buy a property, make repairs and/or improvements to the property, and sell it later for a profit.  A passive investor might hire a real estate firm to find and manage an investment property for him.  Typically, investors choose real estate for several reasons: cash flow, capital appreciation, depreciation, tax benefits and leverage.

Yeguada Militar de Jerez de la Frontera: Yeguada Militar de Jerez de la Frontera, (en: "Military Stud of de Jerez de la Frontera") known outside Spain as the Yeguada Militar is the military Spanish stud farm headquartered in Andalusia, Spain, dedicated to horse breeding of purebred Andalusian horses and Arabian horses. Founded in 1847, it became the state military stud farm in 1893.  In the 20th century, as need for cavalry horses declined, the stud's emphasis shifted to become a genetic reservoir to preserve the bloodlines of the Pure Spanish Horse and to continue to breed high quality Arabian horses, with stallions of both breeds being made available to private horse breeders to improve the horses of Spain.  Today, there are two facilities located in the Jerez de la Frontera area, one primarily for stallions, the other for mares and foals, as well as multiple stallion depots across the country.

Real estate investment association: A real estate investment association or REIA may be a for profit or not for profit organization.  The typical mission of a REIA is to provide a forum both for networking as well as for professional level training in real estate investment.  The goals, methods, and tools available to a professional real estate investor are generally not the same as a typical real estate transaction.  For example: a professional investor may do hundreds of deals without even once obtaining a commercial loan to do so.  REIAs are a place for aspiring real estate investors to learn about transaction engineering, or ways to put together deals involving multiple parties in such a way that each party benefits from the transaction.

Supporting paragraphs: Don Adams (boxer) Roy Shaw
Answer: England