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Your going at it wrong: I assume your a renter and the offenders may be also? One term of a rent implied or otherwise is:' U have the right to the 'peaceful use of the premises'. These people have denied U this. If you have the same land lord Withhold the rent till he solves the problem. Make sure the landlord knows the money's available upon his timely action. If not SUE 'EM! That's hardly a 'threat to kill them' all nice and legal too! I'm sure English procedures must B similar

Can I sue a noisy neighbor?
If your neighbor keeps disturbing you, you can sue, and ask the court for money damages or to order the neighbor to stop the noise ("abate the nuisance," in legal terms). For money damages alone, you can use small claims court. For a court order telling somebody to stop doing something, you'll probably have to sue in regular court.
Of course, what you really want is for the nuisance to stop. But getting a small claims court to order your neighbor to pay you money can be amazingly effective. And suing in small claims court is easy, inexpensive, and doesn't require a lawyer.
To win, you'll need to show:

• There is excessive and disturbing noise.
• The person you are suing is either creating the noise or is the landlord and therefore responsible.
• Your enjoyment of your home is affected.
• You have asked the person to stop the noise.

To prove your case, use police reports, witnesses, your own testimony, or even a recording.
How much money should you sue for? In most states, small claims courts limit judgments to between £2,500 and £7,500. (For the amount in your state, see How Much Can I Sue for in Small Claims Court?) Requesting £20 a day for your trouble would probably be considered reasonable. If the noise problem is really severe -- keeping you from sleeping or working and making you completely frazzled -- make it £100 a day.

Quite naturally With your back being the more aggravated etc I'd throw in 'pain and suffering' as well. When U win possibly by default for not contesting, B sure to garnish their waqes from their employer, They'll really hate that! Bottom line; you're yankin' their chain they're not yankin' yours! Word of caution : never approach a domestic squabble while ongoing; I've done so in uniform and they can be extremely dangerous-fingernails and kitchen implements at close-quarters. ..and they'll both turn on you