Spencer is a regular guest on many radio stations across the UK, such as talkSPORT and BBC Radio 2, especially during the grass court tennis season (including his Wimbledon 'factoids' on the Steve Wright in the Afternoon show). Listeners to BBC Radio Wales will also know him for his opinions on everything from Olympic doping scandals to match fixing in football.
In 2016, Spencer joined forces with Neville Southall, the former Wales and Everton goalkeeper, in presenting the BBC Radio Wales documentary Lost In France based on Spencer's book of the same name.
Recorded in England, France and Wales, this critically acclaimed programme told the story of Leigh Roose, maverick goalkeeper and football's first genuine superstar, one of many thousands to have perished during the First World War with no known grave. Leigh was listed as missing, presumed dead, in October 1916 during the Battle of the Somme.
Spencer is happy to receive other radio commissions and invitations to appear on programmes.