You may love him or hate him, but +Rep to Duncan Bannatyne from me for this reaction to threats to his daughter.
someone with that amount of money making promises to pay £££££ to cause injury to someone is irresponsible. paying someone money for information as to who it is is one thing, to pay to cause an injury is something else.
he's solicitng GBH, not only will the person who caused the injury be prosecuted, but so will bannatyne. all it takes, is some unhinged individual to locate the person responsible, and instead of just breaking arms, go the whole hog and severely injure, or worse still kill whoever it is.
the man is not an idiot, you don't get to where he is in life if you are an idiot, so I'm surprised at him making a remark like this, no matter how serious or tongue-in-cheek the intentions might be.
if he's still has the sense that got him to where he is in life, he'll retract the offer.