Unveiling a portrait of Dr Chad Varah, the charity's founder, the Prince of Wales said: "I am deeply appreciative and full of admiration of everything these remarkable volunteers do; that you give up so much of your time and provide your love and compassion in this way."
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The Marsh & Parsons poster - captioned "a charming period property with a modern extension" - soon prompted criticism.
The track will be demolished to make way for a housing development and a new Stadium for AFC Wimbledon.
Just four authorities (Hammersmith & Fulham, Hillingdon, Newham and the City of London) have chosen to freeze council tax altogether.