By 2002 he had established himself as one of Britain's best athletes, winning the British AAA title, and running in the successful Team GB squad at the European Cup.

In the Commonwealth Games that year, he helped guide Wales to a silver medal in the controversial 4 × 400 metres relay, which was won by England, and disputed by many, including the athletes themselves.

At the 2006 European Athletics Championships in Gothenburg, he won the silver medal in the 4x400 m relay with the British team, as the finishing sprinter, along with Robert Tobin, Rhys Williams and Graham Hedman, in a time of 3:01.63.

Citing his disappointment in missing the 2008 Beijing Olympics, he said that "taking an individual or relay spot in the Berlin World Championships from an aspiring 2012 Olympian would be disingenuous and unfair".

[1][2] Benjamin is married to a sweetheart from his schooldays, Natalie Lewis, an accomplished Welsh middle distance specialist in her own right.