Ok - I would speak to Environmental Health or the Chief Officers Office at the Council.
They should come out and install noise equipment. If they refuse then you can complain to the Local government Ombudsman.
They offer a free, independent service and can examine your complaint for free: www.lgo.org.uk
Or you can consider proceedings for noise and harassment against these neighbours yourself.
You would need to issue proceedings using form N1:
The Court will list the matter for hearing and decide whether to make an order stopping them being noisy and harassing you.
If the Court makes the order and they break it, this is contempt of Court which they could be warned, fined or sent to prison
Can I clarify anything for you about this today please?