last monday my mate had his house broke into by two men, went straight upstairs to where him, his 8 year old daughter and 6 month pregnant GF were all sleeping and threatened with machete's asking for the car keys (seat leon K1), he threw them out the window for them to get and said they would be back, they his gf wont go back tot he house since and they want to sell it, his car was smashed up a few days later in a car chase.
Another friend woke up to a knife held to him for his tuned focus ST keys, he told them where they were and they ended up leaving with them but dropped them on the drive and left without the car strangely.
Both these incidents happened near Birmingham, to me its not worth it, even if they are empty threats with weapons id rather not find out, they can have it, thats what you have insurance for. Anyone that says they would fight blah blah needs looking at IMO. Especially if you have family/anyone else in the house with you.