Question: What English television presenter originally hosted the British television and radio talent show Opportunity Knocks?

Context paragraphs:
Grace Kennedy (singer): Grace Kennedy is a British singer and television presenter who was born at Montego Bay, Jamaica on 2 March 1958.  She first came into the public eye after winning TV talent show Opportunity Knocks.  She was subsequently signed up by the BBC to present her own Saturday night prime time entertainment show, The Grace Kennedy Show, which ran for six series from 1981–1983.  Guests on the show included Bruce Forsyth and Derek Griffiths.  She has also appeared on The Royal Variety Performance, Live From Her Majesty's, and Magnum, PI.  Grace starred in the 2005 UK production of Thoroughly Modern Millie alongside Lesley Joseph, Elaine C Smith and Donna Steele.

Pam Ayres: Pam Ayres MBE (born 14 March 1947) is an English poet, comedian, songwriter and presenter of radio and television programmes.  Her 1975 appearance on the television talent show "Opportunity Knocks" led to appearances on other TV and radio shows, a one-woman touring stage show and performing before the Queen.

Ant &amp; Dec's Saturday Night Takeaway: Ant & Dec's Saturday Night Takeaway, often referred to simply as Saturday Night Takeaway or SNT, is a British television variety show presented and executively produced by Ant & Dec.  The show was first broadcast on 8 June 2002 on ITV.  It was broadcast live from The London Studios on the South Bank from 2002 till 2017.  The format was heavily influenced by previous Saturday night light entertainment shows, most notably "Noel's House Party" and "Don't Forget Your Toothbrush", while individual items often pay homage to Saturday night TV of the past, such as "Opportunity Knocks".

Angie Miller (British singer): Angie Miller, also known as Angie O'Keefe, is a British singer.  She was a member of a band known as New City Sounds, which performed on the BBC television programme "Opportunity Knocks".  The band won twice in the talent competition.  After her two appearances on "Opportunity Knocks", Miller left the band and recorded music in the early 1970s under the RAK Records label, which was owned by Mickie Most, who also produced her music.  She recorded two songs "Born To Be Loved By You" and "Stardust In Your Eyes", as well as an album, titled "A Woman's Mind".

Millican &amp; Nesbitt: Millican & Nesbitt are a British vocal duo, comprising Alan Millican and Tom Nesbitt.  They were former miners from Northumberland, England, who won the UK television talent contest, "Opportunity Knocks", in 1973.  They went on to release two charting singles and three albums. Millican & Nesbitt appeared on the final version of "Opportunity Knocks" hosted by Hughie Green in 1978.

J. D. Roth: James David Weinroth (born April 20, 1968), better known as J. D. Roth, is an American television personality, actor, children's game show host, a voice-over performer on many television programs, and a television producer of reality shows.  Roth is the co-creator of the reality show "The Biggest Loser" on NBC.  He also hosted ABC's fall 2008 series "Opportunity Knocks".  He is currently the announcer of the ABC tv show, "Extreme Weight Loss".

Opportunity Knocks (UK TV series): Opportunity Knocks is a British television and radio talent show originally hosted by Hughie Green, with a late-1980s revival hosted by Bob Monkhouse, and later by previous winner Les Dawson.

Berni Flint: Bernard "Berni" Flint (born 26 May 1952, Southport, Lancashire, England) is a singer and songwriter who holds the record for the longest continuous run of wins on the ITV talent show, "Opportunity Knocks".

Hughie Green: Hugh Hughes Green (2 February 1920 – 3 May 1997) was an English television presenter.

Mike Doyle (comedian): Mike Doyle is a British comedian, vocalist and broadcaster from Carmarthen, Wales, but is now based in nearby Bridgend.  Doyle made his debut television back in 1988, winning the BBC One talent show "Opportunity Knocks".

Supporting paragraphs: Opportunity Knocks (UK TV series) Hughie Green
Answer: Hugh Hughes Green