At the 2001 European Disabled Swimming Championships in Stockholm, Sweden, David won five gold medals including a clean sweep of the S7 50 m, 100 m and 400 m freestyle events.

His medals came in the following events:[3] His achievements at the 2000 and 2004 Paralympics, alongside his previous successes for Great Britain, earned David an MBE for his services to disabled sport in the Queen's New Years Honours.

David retained his Commonwealth Games men's multi disability 100 m freestyle bronze medal at the 2006 event held in Melbourne, Australia.

He retained his S7 50 m freestyle World record off Great Britain rival Matthew Walker in April at the British Swimming Championships in Sheffield setting a new time of 27.67.

In winning this 11th gold, David Roberts equalled Dame Tanni Grey-Thompson's record as being Wales and Britain's most successful Paralympian.

He took a seat alongside regular team captain Matt Dawson and guest teammate, English cricketer Marcus Trescothick.

David was inducted into the Welsh Sports Hall of Fame along with J.J. Williams and Clive Sullivan at a ceremony held in Cardiff on 5 June 2009.

Despite only recently returning to action after a period of prolonged injury and illness, he still managed to retain his S7 100m Freestyle crown, alongside picking up a silver and two bronze medals.

He was selected and competed for Wales at the Delhi 2010 Commonwealth Games, coming 4th in the S7 100m Freestyle, an event which saw him swim against competitors a class higher than his own.

In April 2012 Roberts was omitted from the GB Swimming Team for the Paralympics at London 2012 because he did not meet his qualifying times due to having pneumonia three weeks before the trials.