I've lived backing on to a pub for years. There is noise on the summer, but I bought a house near to a pub, so I can't complain about that!
However of late it's become a lot more common for kids to play football in the garden. Smashing balls into my fence and those of the other surrounding homes, balls coming into my garden, my evenings being disturbed by kids knocking on my door asking for balls back (which I can't always do as they've disappeared into my large bushes and I'm not about to go crawling around in there looking for them!). On one memorable occasion a parent just 'popped their child' over the 6ft high fence and I wandered into the living room to see a random child in my garden!
It's getting worse though and kids are often out playing football in the pub garden well into the evening, screaming and shouting and kicking against the fence. Last night they will still there at 10:30. Having checked the license, kids have to be off the premises by 9pm. I have audio of the kids at 10pm. I also assume (though don't know for definite) that the kids are unsupervised, as their parents are inside the pub.
I'm dreading a summer of constantly interrupted evenings where I can't sit out peacefully in my garden. Would I be unreasonable to go and see the landlord and point out that he's in breach of his licence if kids are out there past 9pm, and also ask if he could consider doing something to prevent football being played in the pub garden? I'm even happy to offer to make a contribution towards play equipment, which the pub used to have, as footballs were never a problem when that was there.
While I'm not a pub drinker, I do see the importance of them for communities, so I would be reluctant to actually shop him for breach of licensing conditions (not least because I suspect there would be repercussions for me), but it would be nice if they could be slightly more considerate neighbours.
(FYI I tried to call the pub last night and ask them to tell the kids to quieten down, but their published phone number does not work)
So: YANBU - go and have a conversation with the landlord, see if there is a solution to be had.
YABU - you bought the house where you bought it, the landlord has a right to let kids play football if that brings custom. Suck it up and get used to noise.