Gents,
Things like this make me smile. The press have made a good job of convincing us all we will end up in prison if protect ourselves or others. Its crap.
Common law allows for you to use as much force as YOU deem reasonable at the time, to defend yourself or another. That reasonableness can be on a mistaken belief. For example you thought he had a knife and beat him with a handy metal sporting bat, but in fact it was a set of keys he had. Things like size, number of bad guys or the fact your kids are upstairs and you are the last line of defence all add up to increase what you deem reasonable.
Basically, you can do what you think was necessary. If that means you beat them till they are unconscious and no longer a threat as you felt that was the only option you had, then that is a defence. Police Officers regularly use this to defend their actions when utilising defensive skills (or even having fatally shot someone.)
Yes you may be interviewed under caution or worse case be arrested. But how many cases have actually gone to court in recent years since the law changed?
You can legally posses things like bats etc at home, they only become offensive weapons if you take them outside. Obviously prohibited articles like CS Gas or Tasers are illegal even in your house.
But more importantly, why would you grab your airsoft gun to confront someone breaking into your home? A bluff should only be an option when its the only option. Other than that I'd be grabbing for a knife in the kitchen, a bat, or as a last resort his neck!
Don't be afraid to defend yourselves or your families.
CBH