A family who were violently assaulted and threatened in their home by a masked burglar - who kicked the pregnant daughter in the stomach - are to appear on BBC’s Crimewatch programme tonight.

The Stiff family were the victims of the violent burglary at their Kingswood mansion on the evening of Wednesday, November 12. 

Mother Catherine, in her 50s, and daughters Katie and Chloe, both in their 20s, were assaulted and threatened by a man who entered their home while they were watching television at about 5.45pm.

From November 20 2014: Images of diamond watches and rings released during Twitter reconstruction of armed robbery

From November 18 2014: 'Horrified': Community still in shock after man 'with shotgun' pulled off jewel robbery

Katie Stiff was pregnant with her first child, who is due next month.

He forced the three women to remove their jewellery before violently assaulting them and forcing them to open a safe from which more high-value jewellery was stolen.

In the BBC’s reconstruction, the man is seen shouting "get down" to the three women after entering the house and then directing them up the stairs, in a line, one behind the other.

The man appears to be holding a weapon to one of their backs and the women are also seen lying on the floor on their fronts crying.

In the programme, Robert Stiff says the family moved to the house four years ago and that they had been looking for a "real family home where we could all come into and really enjoy".

The family say the fact Katie Stiff is pregnant was the most traumatic part of the attack.

Her mother Catherine says: "He went to Katie and booted her in her side, in her tummy where she was pregnant.  

"I just thought ‘what’s going to happen to the baby’."

Her sister Chloe adds: "Although what happened on that night was traumatic, it’s the after-effect of what is left behind that’s even worse."

Robert Stiff calls the perpetrator "a coward".

"That’s probably the most upsetting part, with Katie being pregnant.  

"At a time when we should be celebrating, there was so much sadness in the house," he tells the programme.

Detective Chief Inspector Antony Archibald, the senior investigating officer, will also feature on tonight’s Crimewatch and is appealing to anyone with information to contact the police.

He said: "This was a horrifying ordeal for the family involved.  

"They believed they were going to come to some serious harm.  

"It is every family's worst nightmare.

"The family's eldest daughter is expecting their first grandchild and was heavily pregnant at the time of the offence. 

"This did not seem to affect the intruder, who kicked her and her mother and sister in the stomach even after they had given into his demands.

"They were fully compliant throughout the incident.

"In the time which has past, I believe the offender will have confided in someone about the offence but he probably failed to mention that he violently assaulted a pregnant woman.

"If you are this person, please come forward and speak with us.

"I believe the family was specifically targeted because the burglars had very detailed demands and I am sure someone will be able to piece all of these pieces together and provide us with a name for the offender.

"I would also urge anyone who has been offered any of the stolen items for sale or who knows a person who has suddenly come into possession of such an item and has their suspicions about them to provide information.

"Someone, somewhere knows who is responsible for the appalling attack and I would urge them to either contact Surrey Police or the independent charity Crimestoppers anonymously on 0800 555 111 with information and help us bring this man to justice."

Joe Mather, Crimewatch editor, added: "We are hopeful that our accurate reconstruction made in close collaboration with Surrey Police will encourage viewers to contact the programme with the crucial information needed to catch this dangerous offender and help bring some piece of mind to the Stiff family."

Crimewatch is due to be broadcast on BBC1 at 9pm on Wednesday, 21 January.

Anyone with information on this attack should call East Surrey CID on 01483 631239 quoting Op Vesuvius.

Information can be passed to the independent charity Crimestoppers anonymously on 0800 555 111. Individuals may be eligible for a reward if their evidence leads to the arrest and conviction of a person responsible.

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The Stiff family home in Kingswood, above, and Robert Stiff, below 

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The Stiff's eldest daughter Katie is expecting a child next month and was kicked in the stomach 

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Catherine Stiff, above, and the family watching television when the burglar entered, below

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The reconstruction shows the moment the masked man entered the home, below 

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The reconstruction shows the masked man, above, shouting "get down"

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The burglar leads the women upstairs, above, and appears to have a weapon against one of their backs - police have not commented on suggestions a gun was used in the robbery

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The Stiff women can be seen lying on their fronts on the floor, crying, while the man threatens them

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Chloe Stiff, above, said the after-effects of the attack have been "even worse" than the trauma of it   

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Robert Stiff tells Crimewatch that the masked burglar is a "coward"