Contact your local council. The environmental health team should be responsible for noise complaints. You need to make a detailed log of time and dates and details of EVERY noise incident. Start doing this even before you call the council.
They will usually advise you to keep this log, and send it in once you have filled one or two sides of A4.
They should then start investigating, including, if necessary, putting noise equipment in place.
In the mean time, they may offer to write a letter to the neighbours asking them to be considerate.