Its foul water....I've secured the steel plate on temporary because when it was found it just had a loose steel manhole lid...yep not fixed...not safe.
It never had one...i found it under soil of my garden, while scraping soil off I nearly ended up down it. When lids off I'll take a pic....but it is just a normal polypipe tray in the bottom, nothing special.....thought it was main sewer or summat but its just the house pipes.
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