It is hard to believe that 2013 will mark 20 years since Stephen died.
This time last year we faced the conviction of two of Stephen's killers and the relief I felt then has stayed with me through the extraordinary year that was 2012.
Despite this, our focus has to be on the next 20 years. There is more to be done to get justice for Stephen and to ensure that no other family has to go through what we endured.
More top news
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."