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Ooof!
We’ve also done some digging (shit pun alert) and found out from the previous owners that the problem drains lead to a soakaway under the garden. In the time they owned the house it rarely caused them an issue except when they pressure washed that area and the drains couldn’t cope with the volume of water and they’d brush it away. So hoping we can make do. The prospect of having to relocate a soakaway isn’t one I relish.
An update on this... we managed to clear one of the surface water drain pipes using the pressure washer and drain clearing hose/attachment.
The other was a bit more complex: