i live in a townhouse and use 2 white noise machines. they do help a lot, but it sounds like it wont totally drown the noise you're talking about.

you may want to looking into some proper noise-cancelling headphones.

this is short-term. in the long-term, id start going through the process of documenting each day/time they're being loud, making recordings, sending reports to the council, etc etc. r/britishproblems see posts like this often enough that they're prepared with more thorough advice on how to proceed.