His post started: "Some personal news……I've been diagnosed with Stage IV advanced prostate cancer."
He continued: "I'm responding positively to their excellent treatment, and feeling well.
"I'm blessed to be fortified by the monumental love and support of my wife, family and close friends.
"Needless to say my message to all men over 50, in high risk groups, or displaying symptoms, is get yourself tested and campaign for routine prostate screening by the NHS.
"Early detection is crucial. And be aware, this disease can sometimes progress rapidly without obvious symptoms."
He added that he is hoping to take part in a charity bike ride organised by Olympic champion Sir Chris Hoy, who also has prostate cancer, in Glasgow in September.
The Tour De 4 ride will aim to change the perception of people living with stage four cancer.