Leonard became the World's most capped player of all time during the World Cup last November and won his 114th cap in England's 50-9 victory over Italy in Rome last month (15th February).

"I have no doubt that this is the time to bow out of international rugby for the right reasons. You have to put a stop to your career at some point and that time has now arrived," said Leonard. "This is my decision, I have nothing to prove to anybody and I have been lucky enough to have achieved more than I could have ever dreamed of when I started in 1990."

"I have no regrets and have enjoyed every minute, but I realise that by not making myself available for England's summer tour that this had to be my final Six Nations campaign."

Leonard played his first full international for England against Argentina in 1990. He then reached the landmark of 100 caps in the game against France at the start of last year's Six Nations Championships (15th February 2003) before overtaking Philippe Sella (111 caps) as the world record holder in the World Cup semi-final, again against France, on 16th November.

"I had a long and positive chat with Jason this morning when he told me of his decision, " said England Coach Sir Clive Woodward. "Jason has been an outstanding ambassador for the game on and off the pitch. All of his caps for England have been earned on merit and his contribution towards four Grand Slams and a Rugby World Cup win with the national team has been massive over the last 14 years."

"Jason has played at the top level of the game for his country, the British Lions & Irish Lions and NEC Harlequins with distinction and he will be sorely missed by his team mates in the England squad, the coaches, management and of course the fans."

"There are two games left in the RBS Six Nations for England and Jason remains in contention for each of them."

"When Jason decides to retire from club rugby I would like him to consider a coaching role within the game and hopefully at the RFU. He has a lot to offer and his experience would be invaluable."

"On behalf of the England team I'd like to wish him every success in the future."