Question: When was the British former professional boxer born who competed from 1971 to 1980 who had a bout with Jorge Victor Ahumada?

Context articles: Audley Harrison
Jorge Ahumada
John Conteh
Herbie Hide
Jane Couch
Joey Singleton
Danny McIntosh
Sean Hughes (boxer)
Wayne Elcock
John Murray (boxer)

Audley Hugh Harrison, {'1': ", '2': ", '3': ", '4': "} (born 26 October 1971) is a British former professional boxer who competed from 2001 to 2013.
 As an amateur he represented Great Britain at the 2000 Olympics, winning a gold medal in the super-heavyweight division and becoming the first ever British boxer to win Olympic gold in that division.
 Harrison turned professional the following year after signing a contract with BBC Sport, and went on to have seventeen fights on the network before their cancellation of all boxing broadcasts.
Jorge Victor Ahumada (born 1946) is a former professional boxer.
 Notable fights include four bouts with Victor Galindez, (one of which was a world title challenge at the Madison Square Garden in New York, New York), a title bout with Bob Foster (Foster's last title defense) which ended in a draw, and a bout with John Conteh for the WBC Light Heavyweight Championship.
John Anthony Conteh, {'1': ", '2': ", '3': ", '4': "} (born 27 May 1951) is a British former professional boxer who competed from 1971 to 1980.
 He held multiple light-heavyweight championships, including the WBC title from 1974 to 1978; and the European, British, and Commonwealth titles between 1973 and 1974.
 Conteh was awarded an MBE in 2017 for services to boxing at the Queen's Birthday Honours.
Herbie Hide (born Herbert Okechukwu Maduagwu; 27 August 1971) is a British former professional boxer who competed from 1989 to 2010.
 He held the WBO heavyweight title twice between 1994 and 1999, as well as the British heavyweight title in 1993.
Jane Couch, {'1': ", '2': ", '3': ", '4': "} (born 14 August 1968) is a British former professional boxer who competed from 1994 to 2007.
 She became the first officially licensed British female boxer in 1998, and won numerous world titles.
 Couch has since become a boxing promoter.
Joey "The Jab" Singleton, was a professional boxer born in Kirkby, Liverpool, England.
 Born 6-6-1951.
 Joey was a light welterweight boxer and won the British title in a distinguished career as a professional.
Danny McIntosh (born 1 March 1980) is a British former professional boxer who competed from 2005 to 2014.
 He held the European light-heavyweight title in 2011 and competed in the thirtieth Prizefighter series.
Sean Hughes (born 5 June 1982) is a British professional boxer born in Pontefract, West Yorkshire.
 He now resides in South Shields.
 He is most notable for defeating the then British Super Bantamweight Champion, Esham Pickering in December 2007.
 Pickering was on the verge of stepping up to European and even World level before the bout and it was expected to be a routine victory for the Newark champion.
 However, at the Nottingham Arena in front of the SKY TV cameras Hughes won a points victory over 8 rounds.
Wayne Elcock (born 12 February 1974) is a British former professional boxer.
 Who was managed by Frank Maloney at the start of his career and promoted by Panix promotions before moving after 2 winning fights to Frank Warren, then later to Mick Hennessy.
 Elcock was trained in Leicester to begin with by Jez brogan, before moving to London to be trained by both Frank Maloney and Alan Smith, along with several visits to america to build on his skills, where Wayne worked with Goody Petronelli the trainer of former world champions Marvelous Marvin Hagler and Steve Collins at his famous Brockton gym.
 Wayne came back to his home town to team up with Birmingham's most successful boxing trainers brothers Paddy & Tommy Lynch.
 Knocking out fellow contender Darren Rhodes in 1 minute 30 seconds in Elcocks homecoming and first ever fight with the Lynch brothers in Birmingham at a sold out Aston Events Centre, this setting up his first attempt at the prestigious British title Lonsdale Belt against Plymouth's Scott Dann (boxer) in the first British title fight to ever be scored by three judges, after defeat Wayne bounced back with two back to back knockout victories one of them a British title eliminator winning by TKO against Scotland's Lawrence Murphy, who was the only other boxer to have beaten Elcock, In Wayne's next contest he faced the English champion Steven Bendall who was to be yet another stopped, but this time over eight punishing rounds and setting up his next contest where he would become the first British boxer to beat long standing British champion Howard Eastman to win the coveted Lonsdale Belt in 2007, Elcock also won the Commonwealth title and the minor WBU World Middleweight title becoming the first Birmingham born fighter to ever hold a version of a World title.
 Elcock challenged for the IBF middleweight title against the unbeaten World champion Arthur Abraham on 8 December 2007, losing by a fifth round knockout.
 Wayne bounced back from his world title attempt defending the lonsdale belt with a TKO win against local Dudley rival Darren McDermott, before losing the next defence to fellow Birmingham fighter Matthew Macklin in the Battle of Brum Elcock retired at the age of 36 in 2009 to concentrate fully on his other business matters and today Wayne can be found mentoring in schools and behind the counter at Mad Dog's Boxing shop in Boldmere, Birmingham, as well as coaching in the evening at the multi award winning company Wayne Elcock's Box Clever and at his own amateur boxing club Wayne Elcock's Boxing Academy, located in Chelmsley Wood, not far from where he grew up.
John Murray (born 20 December 1984) is a British former professional boxer who competed from 2003 to 2014.
 He held the English lightweight title from 2007 to 2008; the British lightweight title twice, from 2008 to 2010; and the European lightweight title from 2010 to 2011.
 He also challenged once for the vacant WBA lightweight title in 2011.
 John is the brother of British former Olympian Joe Murray.
 Since retiring, Murray has opened his own gym – Murray Machines Gymnasium – in Reddish, where he trains both amateur and professional boxers.