As the Mail launches landmark campaign for dementia carers, TV news veteran and sufferer Alastair Stewart says: 'I'm at the point where I wonder if life is worth living... I only exist because of Sal'

Sartorially, he is still unmistakably Alastair Stewart, the man whose 40-year career at ITV made him the longest-serving male newscaster in Britain. And yet things are so very wrong...

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