WHOA!
>>At back of house on the corner is the downpipe from the gutter that leads into a drain and then bends away under the mono block.
>>About 3 metres away, down the side of the house and in line with the first drain, and in a sloping downwards gradient is drain number 2. This is where the washing machine and dishwasher only run into.
Are you saying that both your rainwater and foul water lead into the same sewer? If so I'd be very surprised. How old's the property? IME you'll have a surface water (rain) and foul water (everything else) drains that are completely separate from each other.
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