In the 1927 secondary school game against France, Tarr was one of seven Welsh players that would later represent their country at senior level.

[4] Tarr joined Cardiff in 1931 and soon found himself in the squad to face the touring South African team.

Both men were last minute substitutes, as Tarr was a replacement for the injured Tom Day and Davey was brought from Sale to cover for Idwal Rees.

"[7] With ten minutes of the match remaining, a loose scrum broke up to reveal Tarr laying motionless on the ground, and the referee, Cyril Gadney, called for a stretcher.

In a coincidence, his opposite number at hooker in his only appearance for Wales, Bill Hadley, was born on the same day as Tarr.