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as far as i remember rainwater downpipe ok to tie in for surface water, waste and sewer pipes aka the stink pipe a no no to tie into.
I know it's a definate no to connecting to the main water waste pipeline under the garden just unsure as to what else can and can't be done.
Definitely no to connecting to mains drainage. Has to be a soakaway or similar. But not sure what the law is if their waste goes into a cesspit. Anyone know?
I also put drainage into a senior scottish water engineers garden who insisted it went into the rwp and not run off and as engineers tend to he give me the reasons and insisted this was absolutely acceptible. Its possible that there is a varience between the building standard regulations( Scotland) and the UK ones as there are many differences on the construction side of things.
The reason is simple- in periods of high rainfall, if everyone put their storm drainage into the foul drains, the system would be overwhelmed forcing the release of untreated sewage, usually into the sea as a last (controlled) resort.
The properties existing storm drainage will usually run to a soakaway. Sometimes they run into council mains storm drainage that will head to the nearest watercourse.
Connecting storm drainage to foul is sometimes allowed, subject to a hefty annual charge from the water company.
this might help http://www.gov.scot/resource/buildingstandards/2013Domestic/chunks/...
look farther down about garden drainage and soak away connecting into drains its all there look at it a bit closer