After coming out of his first visit to the cold chamber Prince Harry was asked how he had found the conditions, "cold" he said. Joking with the waiting press pack, he added: "it's your turn next."
Over a 20-hour stay the prince joined the Walking With The Wounded team as they prepare for their South Pole trek.
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The Metropolitan Police Federation, which set up the official JustGiving site, said it felt a "suitable amount" had been collected.
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."