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We have a little courtyard back garden with a communal drain shared between 4 houses and we are the furthest away from the sewer. The trap at the sewer end was blocked with fat so our shared part was filling up with water. Scottish water came and sorted it, but in doing so dislodged more fat and unknowingly blocked it.
A couple of weeks later we had torrential rain and the back garden was 6 inches deep with water, running through the air bricks - I was quite glad we had the drain unblocking attachment!
I think I'm with others in saying free drain cleaning pipe isn't free enough. I'd rather pay someone else to do it. 🤢