Ms McGhee, who lives in the Greenwich area, found a lump on her neck in 2017, the same year she performed at the FA Cup Final at Wembley.
She had her operation within a week, but said her mind was full of worries while she waited for treatment at Guy’s and St Thomas’ Hospital.
“I took myself to a church the night before (the operation) and I sang every single aria of every single role that was on my wish list,” she said.
“That was the last the last thing I did just in case I never, never got to sing again.”
Mr Walton, from Streatham in south London, said after his diagnosis he went for a walk at Borough Market but was “in a daze, not really being present, just picking things up and being aware that I was not of my usual mind”.
“In that waiting time, all kinds of fantasies are going on in your head about possible scenarios.
“Particularly as I was living alone, that coming home to a flat on my own – your thoughts would be really loud.”
