The parents of the murdered teenager Jimmy Mizen are to receive an MBE for their work with young people at Buckingham Palace later.
Margaret and Barry Mizen worked tirelessly to raise young people's awareness of the consequences of violent crime, following the death of their son in 2008.
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The president of the respected Royal Institute of British Architects became the latest high profile figure to enter the row.
The victim, thought to be in his 40s, was attacked in Bromley at around 11:30am. His condition is still unknown.
The eagle-eyed resident spotted the mistake on signs just feet apart in south London.