She said: “This represents a failure of the health and legal system that should protect the public and care for those with severe mental illness.

“I hope that following Jeroen's death, an independent investigation will take place and answers will be provided to these simple but pressing questions.

“Why was this individual granted bail after assaulting a police officer and wielding knives in public?

“How can this individual, who was mentally unwell and armed with knives have been at liberty on the day he killed my husband?

“Why on the 23 Dec 2015 did the crown prosecution service drop the knife possession and assault charges against this individual just six days before he killed Jeroen?

“Will those who made that decision in some way be held accountable?

"This may help others from being in the same position my daughter and I now find ourselves in.”

She added: “The lesson will not have been learned until concrete changes have been implemented”