Estate charge - legality of extra fee

[Ungarsee]

I live on a new build estate which is a mixture of houses and flats (I'm in a house). The flats on site have a communal bin dump and it's this that has been causing issues recently. In short, the bin dump is for the sole use of the flats but, according to the managing agents and based on hear say, some house owners have taken to dumping large items in there so a combination lock was put on the gate three months ago to combat this. Unfortunately the lock just keeps getting broken and large items carry on getting dumped.

My specific issue though is with the estate charge. The houses pay a relatively small fee to cover general up keep of the estate but I've just found out they will be spreading the additional cost of the regular clear ups in the bin dump across all residents (flats & houses). Are they legally able to just penalise all residents when only a small number are causing this issue? As my house overlooks the entrance to the bin dump I have offered for them to put a camera in my window so the actual culprit can be charged but they didn't exactly jump at the opportunity!

[Ungarsee]

Social housing present but they are good as gold. It's the renters in the private flats who cause all the issues.

Rude boy, thanks for your comments. I'm going to check the deeds but pretty sure there's no getting out of it, I'm just pee'd off that I'm basically subsidising a fly tipper. Overall the costs, once split between all properties, are going to be minimal so I'm just going to create extra work for the managing agents to try to annoy them into improving the security!