He was educated at Cardinal Newman Catholic School, Hove and undertook further studies at Anglia Ruskin University.

[1] While studying for his degree at Anglia Ruskin, Poysden made his first-class debut for Cambridge MCCU against Essex in 2011.

[3] Poysden scored 47 runs in Cambridge MCCU's first-innings, before being dismissed by Matthew Spriegel.

[4] On 31 July 2015, Poysden took a catch to dismiss Mitchell Starc off the bowling of Moeen Ali while fielding as a substitute in the third Ashes Test match.

[6] In July 2019, Poysden suffered a fractured skull during a training session, and was ruled out of the rest of the season.