Every summer this family use their patio/ garden to sit out in the evening sometimes till midnight and later. They are very noisy. Just the usual stuff- bit of music, loud chatter, worse with some drink, maybe some teenage kids involved as well. We aren't immediately next door (it's not a street layout, but a village where a few houses are scattered around.) There are 3 other cottages closer to them who presumably don't complain, which makes it harder.
It's got the point when we (go to bed between 11 and 11.30 latest because DH has sporting fixtures and gets up early) can't sleep if we want to leave a window even slightly open, due to their noise. It's a really quiet village setting and I think these people have no idea how a) sound travels and b) disturbs other people.
AIBU to think about asking them to keep the noise level down after 11pm, and if so how would you do it? Anon note, pop round? Never spoken to them ever before.