Stuart Lambie remembers the moment about five years ago when Alzheimer’s disease started to rob him of his father. As the illness tightened its grip, the “true gentleman”, who saw wartime service in the Royal Navy and later ran a successful business, became verbally aggressive towards the wife he had adored.

Lambie, who had never so much as heard his dad Ian swear before, says such behaviour would have disgusted the man his father used to be. “It was just unbelievable that it was the same person. Well, it wasn’t the same person, it was the disease,” he adds.

Financial Times