In an earlier contribution to this discussion,
Lawrence Zarb wrote:

Is it allowable to drain the rainwater from my conservatory into the
main sewer, as this is more conveniently located than the storm drains

Probably not officially, but I did!

A lot depends on whether or not the conservatory is subject to building
regs. If not, there's no BCO involved to tell you which gully to put the
downpipe into!
--
Cheers,
Roger
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