The water supply company could always be asked if/what they would charge for clearing a blockage in a "private sewer". Excellent Wessex Water hinted that they might do the job once (only) for free. Dynarod would probably cost a lot. Any shared section is now a "public sewer" and the company's responsibility.
Running rainwater into a sewer risks blockages from overloads in storms and material such as leaves, also the sand that collectsfrom the near-imperceptible erosion of clay roof tiles. Wessex give a discount if rainwater is diverted to soakaways.
Septic tanks shouldn't be soakaways but watertight. They need to be pumped out from time to time into a road tanker, for disposal off site.
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