Background - H and I moved into our new flat 2 months ago. Technically it's a "first floor maisonette," so we have our own front door on the ground floor, then entrance hall and stairs up to the flat proper. There is another flat below us, whose front door is next to ours. I think that the people there moved in a few weeks after us, they're younger than us and possibly students. I have only met them twice, collecting parcels etc.
Both flats have their own wheely bins, kept in separate places - ours are on a little paved area by the front doors, theirs are just round the front of the house. A few weeks after we moved in, we discovered several large bin bags of rubbish in our shared garden. Didn't want to make a fuss (we weren't 100% sure they had been left by the current tenants, could have been from the people who moved out), so I left them for a bit, then when it became clear they weren't going to go, I have started loading them into our bins as much as will fit, and taking them out as usual. Downstairs don't take their bins out for collection each week, but that doesn't bother me.
Until yesterday. They had a party on Friday night, which I had no problem with, it wasn't horribly noisy or anything. But when we went out, we found several bin bags strewn over our bin area and down the path going round the back to the garden. I sneaked a peak in their wheely bin and it is not full. I really don't want loose rubbish bags all over, we'll get foxes/rats etc and it will smell. H and I are both rubbish at confrontation and can't agree on what to do: -
a)nothing, seethe quietly and hope they'll take them away eventually. Possibly put some of the bags in our bins again to take out gradually.
b)knock on the door and have a polite-ish word asking them to clear it up and take their bins out properly when needed. This seems like the grown-up option but is scary!
c)put a note throught the door asking them the same
d)complain to our estate agent. This is what H wants to do but I think it's pointless as it's nothing to do with them and AFAIK downstairs was not rented from the same agent.
What do you think?