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Jason Leonard (born 14 August 1968) is an English former rugby union player, and has been the president of the Rugby Football Union since 2015. Nicknamed The Fun Bus, Leonard was a prop forward who won 114 caps for England and five for the British and Irish Lions. His total of 119 was a world record until 2006, when it was surpassed by George Gregan. Leonard played in England teams which won four Grand Slams (1991, 1992, 1995 and 2003) and the 2003 Rugby World Cup, and was part of the British and Irish Lions squad that won the test series during their 1997 tour of South Africa.

With Dick Best no longer England head coach, the RFU appointed well-known and highly successful Bath coach Jack Rowell as his replacement. There was much speculation amongst many established England players as to what changes the new coach would bring to the England setup, particularly one with such close ties to a successful Bath Rugby Club. Rowell claimed he would rid England of the cautious, forward-dominated 10-man game which had done so well for them earlier in the decade, and play running rugby more similar to Bath's. Leonard kept his place in the England team, which now included several new players such as Mike Catt, Ben Clarke, Victor Ubogu, Steve Ojomoh (all Bath players) and Tim Rodber. In the 1995 Five Nations, Leonard won a record (for a prop) 38th cap for England, playing against Scotland, and the victory meant his third Grand Slam. England held high hopes for the upcoming Rugby World Cup in South Africa. At the World Cup, England were drawn in Pool B, generally regarded as one of the easier groups in the competition. However, England experienced setbacks, gaining only narrow victories over Argentina (24-18) and Italy (27-20). In England's final pool match against Western Samoa, Leonard was rested and his record of 40 consecutive England caps ended. England won that match 44-22 and also won the subsequent quarter-final against Australia 25-22, before losing the semi-final to New Zealand 29-45 and finishing the tournament in fourth place. In November 1996, Leonard skippered England for the first time, against Argentina at Twickenham. The game was very close, with Argentina taking a narrow lead close to full-time. From a rolling maul, Leonard scored a try to level the scores, and a Mike Catt penalty won the game 20-18. The try remains Leonard's only score for England. In the 1996-1997 season, Leonard began to play for England at tighthead prop (number 3) to make room for Leicester Tigers loosehead prop (number 1), Graham Rowntree, and in 1997, Leonard was selected for his second British and Irish Lions tour, this time to South Africa. In September 1997, the RFU appointed Clive Woodward as head coach. The Autumn internationals saw England playing Australia, South Africa and New Zealand. Against Australia, Leonard found himself selected at loosehead prop again, with Wasps' Will Green winning his first cap at tighthead. For the remaining two tests, Leonard was moved back to tighthead. The ability to scrummage effectively on either side of the scrum proved to be one of Leonard's great assets.

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Jason Leonard