Hartwell sorry to here about the pr...ks next door to you .I suggest you make a diary of each incident including times dates and noise is it loud music .or banging shouting ,how long it goes on for .also any photo,s or video evidence.inform Southwark council they should have a nuisance neighbours phone number .they can formally warn the pr...ks of future behaviour.if the noise is very loud music the council will send a member of there nuisance neighbours team who should be on call 24 hours a day .they can confiscate music equipment after warnings.why not give your local councillor a call or email or write a letter if it's affecting your health and mental state there are people who can help you good luck.