Olympic silver-medallist Louis Smith has revealed on Twitter that he turned up at Buckingham Palace without his invitation.
The gymnast, who trains in Basildon in Essex, blamed his manager for forgetting it.
Smith will be presented with an MBE today.
Today is the day I become Louis Smith M.B.E ooooooo exciting times
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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.