He began playing rugby for the Winchester RFC mini rugby sides.
Northampton club rugby
At age 18 he joined Northampton Rugby Union Football Club who were playing in what was then the First Division. His senior debut came in 1994, against Coventry R.F.C.. He had played for the England Students and U21s but had never really felt like he fitted in. He started in the Northampton side that won the 2000 Heineken Cup Final, defeating Munster at Twickenham. He was club captain from 2001 to 2004. He had broken his nose twice that season, but with the Northampton squad stretched, he had continued to offer himself for selection. In September 2003 he sustained a broken ankle while playing a pre-season friendly match for Northampton. He did not recover sufficiently from that injury and in February 2004 he announced his retirement from playing rugby. He made 215 appearances for Northampton and scored 46 tries, playing in 104 English Premiership matches.
International career
Pountney represented England Students and Under-21s, but was told that he was too short to play for Eng;and's senior team. He qualified for Scotland through a grandmother from the Channel Islands. He received his first cap for Scotland in November 1998, in an autumn internationaltest match against South Africa. He had played a part in all the team's matches when Scotland won the 1999Five Nations Championship, where he was a replacement in the first three matches before Jim Telfer selected him in the starting line-up for the match against France in Paris. He was part of the Scotland squad for the 1999 Rugby World Cup, playing in four matches. He scored a try against New Zealand in the quarter-finals, although the All Blacks won the match and brought Scotland's tournament came to an end. In January 2002, returning from injury, he captained Scotland against England in their opening match of the 2002 Six Nations Championship. He made a total of 31 capped appearances for Scotland, scoring five tries. In January 2003 he left Murrayfield in frustration for the last time, after speaking his mind very plainly on the problems he saw there.
Coaching career
Late in 2004 he became head coach of Northampton Saints, together with former England fly-half and teammate Paul Grayson. In July 2005 he became Director of Rugby. After retiring from top class rugby, he has worked as an independent citing officer, reviewing English Rugby Premiership matches. In the summer of 2013 he became Director of Rugby at Bournemouth RFC who were playing in National Division 2 South. The club announced that he was to leave at the end of the 2014 season, citing a change in personal circumstances. He then worked as Head of Rugby at Marlborough College and moved to Regent House School in Newtownards in 2017.