Cyclist Joanna Rowsell tweeted a picture of her hat box, as she prepared for today's outing to Buckingham Palace.
The Olympic champion from Sutton said she was "so excited" about the occasion.
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Police were called to a fight between two groups of people on the petrol station forecourt at Cobham services.
The barriers are part of a series of measures put in place by the Metropolitan Police.
Resident group Justice 4 Grenfell say they were not consulted and will raise concerns about the appointment at the highest level.