'Dear girl, how wonderful to see you,' my friend Jon Snow says. 'Have you been here before?' There it is. The dawning realisation that Jon might not know who I am.

'Dear girl, how wonderful to see you,' my friend Jon Snow says. 'Have you been here before?' There it is. The dawning realisation that Jon might not know who I am.

Former Channel 4 news presenter Jon Snow has revealed he has secretly been battling a dementia diagnosis for three years and wants to be a voice for those also diagnosed

We spoke to Kirsty Lang, who knew Jon for four decades - she was a long time colleague of Jon's here at Channel 4 News and interviewed him for an article in the Daily Mail.