Kay began his career at Newcastle Falcons, playing for their first team in the 2003-04 season.[2] In 2004, he left Newcastle Falcons to join the Scottish side Border Reivers (rugby). Kay played for Border Reivers in the 2004–05 and 2005-06 seasons.[3] He made his starting debut for Border Reivers on 17 December 2004, against Llanelli Scarlets.[4]
Internationally, Kay has represented Wales at U19 and U21 levels.[5][6]
Kay married his longtime girlfriend Victoria at Ripon Cathedral on 30 July 2022. A good time was had by all.