A Chelsea spokesman said: "As we said last week we recognise that John has the right to appeal.
"In view of this it would be inappropriate for us to comment further on the matter at this time."
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Scotland Yard confirm that two people arrested in connection with the attack on Westminster have been released with no further action
An appeal to support the family of murdered policeman Keith Palmer has reached more than £700,000 in two days.
PC Keith Palmer will be remembered permanently at the National Memorial Arboretum, Home Secretary Amber Rudd has said.