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I own a (post 1937) house with a parking area nearby. There is a drain
(strictly a grid or gully) on a part of the parking area that I own. My
neighbours A and B also own sections of the parking area, and it is sloped
so that their surface rainwater runs off into my gully. It looks like the
sewer between my gully and an inspection chamber on A's land has collapsed,
so that water no longer flows from the gully to the chamber. This results in
periodis flooding around the gully.

To complicate matters, neighbours C, D and E feed some of their rainwater
into a sewer that emerges in my gully.

I don't think there are any specific items in the deeds about maintenance,
so am I correct in thinking that I am jointly liable with all of my
neighbours, or possibly just C, D and E (Because although A and B's surface
water feeds, they don't actually have pipes that feed into the broken
pipe ).

The council are aware of the situation but I'm not sure whether they will
try to intervene. I'm planning to talk to neighbour A and B, and then C, D
and E. I'm also thinking about informing my insurance company and getting a
CCTV survey done. Are there things I should be looking out for?

What are my chances of everybody to contributing to repairs? Does the
presence of the gully on my land give me any special responsibility? Do we
need to get things done quickly in order to prevent our insurance companies
from refusing to pay?

Thanks