Having spoke to John twice in the past 2 days I can assure you that he is OK.
He went into Leeds General Infirmary on Wednesday for a procedure called Rotiblation.
This is to open up and clean the arteries around the heart. The procedure was a success.
He came home Thursday morning and rang me Thursday afternoon.
He also rang me today. He is going on holiday for a week as from tomorrow.
Hope this answers the questions.
Andy