A spokesman for the Deputy Prime Minister Nick Clegg said: "This is a personal tragedy for Chris, Vicky and their families.
"After their sentences are served, I hope they'll be given time and space to rebuild their lives."
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ITV News Economics Editor Noreena Hertz said an economic slowdown looms as a fall in retail spending led to gloomy figures.
Detectives in Westminster are investigating after the man was discovered on the Route 189 bus in Marylebone shortly after midnight.
The murderer was shaking and appeared to be gasping for air for around 13 minutes before dying.