After the Tube train had disappeared into the tunnel, you could still find Dr Margaret McCollum sitting on the platform bench, lost in thought.
A few minutes later, another train would arrive. 'Mind the gap!' said the voice on the loudspeaker to disembarking passengers, and Dr McCollum smiled... and still she stayed.
For although that announcement became familiar to millions travelling on the London Underground at Embankment station, the voice had a special significance for Dr McCollum, a recently widowed GP 'He was never very far away in my head and in my heart,' she said. 'And knowing that I could go and listen to his voice was simply wonderful. It was a great comfort.
'I would go and sit on the platform, and sometimes miss a couple of trains just so I could hear it. Although he could do accents, it was his natural speaking voice – clear, precise, authoritative.